Exam (elaborations)

Anatomy and Physiology I Final exam test bank (questions and answers)

Question 1 Correct 1.00 points out of 1.00 Flag question Question text In an ecosystem, energy Select one: a. comes ultimately from bacteria b. cycles along with chemical nutrients c. typically flows from producers through a series of consumers d. typically flows from consumers to producers to decomposers Question 2 Correct 1.00 points out of 1.00 Flag question Question text Life is organized in a hierarchical fashion. Which of the following sequences correctly lists that hierarchy from least inclusive to most inclusive? Select one: a. organism, organ system, tissue, population, organ, organelle, community, cell, ecosystem, molecule b. ecosystem, population, organ system, cell, community, molecule, organ, organism, organelle, tissue c. molecule, organelle, cell, tissue, organ, organ system, organism, population, community, ecosystem d. cell, molecule, organ system, organ, organelle, population, tissue, organism, ecosystem, community Question 3 Correct1.00 points out of 1.00 Flag question Question text Organisms that are prokaryotes are in the domains Select one: a. plantae and Animalia b. bacteria and Archaea c. fungi and Bacteria d. eukarya and Archaea Question 4 Correct 1.00 points out of 1.00 Flag question Question text A theory is Select one: a. an idea that has been proven b. an explanation of an idea that is broad in scope and supported by a large body of evidence c. a description of a belief that invokes the supernatural d. a concept in the early stages that still needs to be tested Question 5 Correct 1.00 points out of 1.00Flag question Question text To be scientifically valid, a hypothesis must be Select one: a. testable and falsifiable b. controlled c. reasonable d. part of a theory Question 6 Incorrect 0.00 points out of 1.00 Flag question Question text Members of the kingdom Animalia Select one: a. are composed of cells that lack a cell membrane b. can obtain their food by eating other organisms c. make their own food through photosynthesis d. can obtain their food either by absorption or by photosynthesis Question 7 Correct 1.00 points out of 1.00 Flag questionQuestion text An antibiotic kills 99.9% of a bacterial population. You would expect the next generation of bacteria Select one: a. to die out due to the drastic decrease in population size b. to be more contagious than the prior generation c. to be more resistant to that antibiotic d. to be just as susceptible to that antibiotic as was the previous generation Question 8 Correct 1.00 points out of 1.00 Flag question Question text A scientist performs a controlled experiment. This means that Select one: a. one experiment is performed, but the scientist controls the variables b. the experiment is repeated many times to ensure that the results are accurate c. two experiments are conducted, one differing from the other by only a single variable d. the experiment proceeds at a slow pace to guarantee that the scientist can carefully observe all reactions and process all experimental data Question 9 Correct 1.00 points out of 1.00 Flag question Question textThe teeth of grain eating animals, such as horses, are usually broad and ridged. This makes the teeth suitable for grinding and chewing. Meat eating animals, such as lions, have pointed teeth that are good for puncturing and ripping flesh. This illustrates Select one: a. a result of natural selection as well as the connection between form and function b. the connection between form and function only c. a food web d. a result of natural selection only Question 10 Correct 1.00 points out of 1.00 Flag question Question text The role of a control in an experiment is to Select one: a. provide a basis of comparison to the experimental group b. ensure repeatability c. counteract the negative effect of the experiment d. prove that a hypothesis is correct Question 11 Correct 1.00 points out of 1.00 Flag question Question text If you eat a hamburger, you are mainly eating ground up beef muscle. What levels of organization are represented in this ground up muscle? Select one:a. organism, population, and community b. tissue, organ, and organ system c. organelle, cell, and tissue d. organ, organ system, and organism Question 12 Correct 1.00 points out of 1.00 Flag question Question text Which of the following statements about genetics is true? Select one: a. dna is made up of six different kinds of nucleotides b. differences among organisms reflect different nucleotide sequences in their DNA c. genes are proteins that produce DNA d. each DNA molecule is a single strand of nucleotides Question 13 Correct 1.00 points out of 1.00 Flag question Question text The ultimate source of energy flowing into nearly all ecosystems is Select one: a. wind b. radioactivity c. electricityd. sunlight Question 14 Correct 1.00 points out of 1.00 Flag question Question text All organisms belonging to the kingdom Plantae Select one: a. are multicellular and lack a nucleus b. are unicellular and lack a nucleus c. are photosynthetic d. obtain food by decomposing the remains of dead organisms and absorbing the nutrients Question 15 Correct 1.00 points out of 1.00 Flag question Question text Kingdom Fungi includes species Select one: a. such as mushrooms and plants b. that obtain food by ingestion c. that use photosynthesis to obtain food d. that obtain food by decomposing dead organisms and absorbing the nutrients Question 16 Correct1.00 points out of 1.00 Flag question Question text The tree in your backyard is home to two cardinals, a colony of ants, a wasp's nest, two squirrels, and millions of bacteria. Together, all of these organisms represent Select one: a. a species b. a community c. a population d. an ecosystem Question 17 Correct 1.00 points out of 1.00 Flag question Question text You notice that over the past month, many students on campus have started wearing a new style of school sweatshirt. You think to yourself that perhaps the bookstore has recently started selling this new sweatshirt style. This prediction is an example of Select one: a. an experiment b. a type of observation c. a hypothesis d. an experimental question Question 18 Correct 1.00 points out of 1.00Flag question Question text Which of the following statements about ecosystems is false? Select one: a. Chemical nutrients cycle within an ecosystem b. Plants and other photosynthetic organisms are producers in ecosystems c. In the process of energy conversions within an ecosystem, some energy is converted to heat d. bacteria and fungi recycle energy within an ecosystem Question 19 Correct 1.00 points out of 1.00 Flag question Question text Which of the following statements about the properties of life is false? Select one: a. all organisms have the ability to reproduce b. all organisms have the ability to respond to stimuli from the environment c. all organisms have the ability to maintain a constant internal temperature d. all organisms have the ability to take in energy and use it Question 20 Correct 1.00 points out of 1.00 Flag questionQuestion text A hypothesis is Select one: a. a proposed explanation for a set of observations b. the same as a theory c. a widely accepted idea about a phenomenon d. an explanatory idea that is broad in scope and supported by a large body of evidence Question 1 Correct 1.00 points out of 1.00 Flag question Question text Typically, nitrogen atoms are composed of electrons, protons, and neutrons. An isotope of nitrogen could Select one: a. have more neutrons than the usual nitrogen atom b. be positively charged c. have more protons than the usual nitrogen atom d. be negatively charged Question 2 Correct 1.00 points out of 1.00 Flag question Question textWhich of the following is a trace element in the human body? Select one: a. nitrogen b. oxygen c. zinc d. hydrogen Question 3 Incorrect 0.00 points out of 1.00 Flag question Question text Radioactive isotopes Select one: a. can be used in conjunction with PET scans to diagnose diseases b. are never incorporated into organic compounds c. are frequently added to foods as nutritional supplements d. do not occur naturally Question 4 Correct 1.00 points out of 1.00 Flag question Question text If you found a fossilized dinosaur bone, what method could be used to determine the age of the fossil? Select one: a. electrophoresis b. radial immunodiffusionc. isotope analysis d. DNA fingerprinting Question 5 Correct 1.00 points out of 1.00 Flag question Question text Waters surface tension and heat storage capacity is accounted for by its Select one: a. size b. hydrogen bonds c. mass d. orbitals Question 6 Correct 1.00 points out of 1.00 Flag question Question text Photosynthesis requires many steps to make glucose. As a result of the synthesis process, Select one: a. all the carbons from the six carbon dioxide atoms are found in glucose b. more carbon dioxide is released from the plant than is absorbed c. more atoms are present at the beginning than at the end d. water is synthesized by the plant from H2 and O2Question 7 Correct 1.00 points out of 1.00 Flag question Question text In the equation 2 H2 + O2 is equal to 2 H2O, the H2 molecules are ________ and the H2O molecules are ________. Select one: a. reactants, products b. products, reactants c. created, destroyed d. used, stored Question 8 Correct 1.00 points out of 1.00 Flag question Question text Which of the following statements about radioactive isotopes is true? Select one: a. When given a choice between radioactive and nonradioactive isotopes of the same atom, living cells are more likely to incorporate the radioactive isotopes into their structures b. the nuclei of radioactive isotopes are unusually stable, but the atoms tend to lose electrons c. radioactive elements are natural and therefore not harmful d. the energy emitted by radioactive isotopes can break chemical bonds and cause molecular damage in cells Question 9 Correct1.00 points out of 1.00 Flag question Question text The body uses atoms in different ways to accomplish different tasks. For example, one portion of the body's calcium supply strengthens bones, whereas another portion combines with proteins to stimulate blood clotting after tissue injury. Which of the statements that follow provides the most logical chemical explanation of calcium's ability to perform such different functions? Select one: a. the calcium in blood is a more reactive form of the atom and therefore has fewer protons than the calcium in bone b. the bone contains calcium salts, which are less reactive than the calcium ions found in the blood c. there are many different isotopes of calcium, and the most reactive isotope is found in the bone d. the calcium in blood has a lighter atomic mass than the calcium in bone and is in a more reactive form Question 10 Correct 1.00 points out of 1.00 Flag question Question text A hydrogen atom has one electron. How many covalent bonds can hydrogen form? Select one: a. four covalent bonds b. one covalent bond c. no covalent bonds d. two covalent bondsQuestion 11 Correct 1.00 points out of 1.00 Flag question Question text Compared to a solution of pH 3, a solution of pH 1 is Select one: a. 10 times more basic b. 100 times more basic c. 100 times more acidic d. 10 times more acidic Question 12 Correct 1.00 points out of 1.00 Flag question Question text What is the fundamental difference between covalent and ionic bonding? Select one: a. in covalent bonding, both partners end up with filled outer electron shells; in ionic bonding, one partner does and the other does not b. covalent bonds form between atoms of the same element; ionic bonds form between atoms of different elements c. covalent bonding involves only the outermost electron shell; ionic bonding also involves the next electron shell inside the outermost shell d. in a covalent bond, the partners share a pair of electrons; in an ionic bond, one partner accepts electrons from the other Question 13 Correct 1.00 points out of 1.00Flag question Question text A water molecule (H O H) is held together by   Select one: a. two polar covalent bonds b. a single covalent bond c. hydrogen bonds d. a double covalent bond Question 14 Correct 1.00 points out of 1.00 Flag question Question text As ice melts, Select one: a. heat is released b. hydrogen bonds are broken c. the water becomes less dense d. water molecules become less tightly packed Question 15 Correct 1.00 points out of 1.00 Flag questionQuestion text Table salt is formed when Select one: a. chlorine gives an electron to sodium b. sodium donates its single outer electron to chlorine c. a hydrogen bond forms between sodium and chlorine d. sodium and chlorine share electrons to form a bond Question 16 Incorrect 0.00 points out of 1.00 Flag question Question text Which of the following statements about water is false? Select one: a. ice is more dense than liquid water b. Water naturally exists in all three physical states on Earth c. floating ice on a pond insulates the liquid water below, slowing its rate of freezing d. if ice sank, the oceans would eventually freeze solid Question 17 Incorrect 0.00 points out of 1.00 Flag question Question text What is the atomic mass of an atom that has 6 protons, 6 neutrons, and 6 electrons? Select one: a. 18b. 8 c. 12 d. 6 Question 18 Correct 1.00 points out of 1.00 Flag question Question text The emission of ________ and ________ are primarily responsible for acid precipitation. Select one: a. nitrogen oxides, sulfur oxides b. halones, CFCs c. carbon dioxide, ozone d. carbon dioxide, methane Question 19 Correct 1.00 points out of 1.00 Flag question Question text Which of the following is another term used for atomic mass? Select one: a. mendel b. dalton c. darwin d. calvinQuestion 20 Correct 1.00 points out of 1.00 Flag question Question text Water molecules stick to other water molecules because Select one: a. water molecules are neutral, and neutral molecules are attracted to each other b. covalent bonds form between the hydrogen atoms of one water molecule and the oxygen atoms of other water molecules c. hydrogen bonds form between the hydrogen atoms of one water molecule and the oxygen atoms of other water molecules d. the oxygen atoms of adjacent water molecules are attracted to one another Which one of the following would be correctly classified as a protein? Select one: a. cholesterol b. enzymes c. starch d. cellulose Question 2 Correct 1.00 points out of 1.00 Flag question Question textA protein containing more than one polypeptide chain exhibits the ________ level of protein structure. Select one: a. tertiary b. primary c. quaternary d. secondary Question 3 Correct 1.00 points out of 1.00 Flag question Question text Proteins differ from one another because Select one: a. the peptide bonds linking amino acids differ from protein to protein b. the sequence of amino acids in the polypeptide chain differs from protein to protein c. the number of nucleotides found in each protein varies from molecule to molecule d. each protein contains its own unique sequence of sugar molecules Question 4 Correct 1.00 points out of 1.00 Flag question Question text High fructose corn syrup is made from corn. The main carbohydrate in corn is a polysaccharide called Select one:a. hydrocarbon b. fructose c. starch d. cellulose Question 5 Correct 1.00 points out of 1.00 Flag question Question text Which of the following is an example of secondary structure in a protein? Select one: a. a globular shape b. the joining of two polypeptide chains c. an alpha helix d. a particular amino acid sequence Question 6 Correct 1.00 points out of 1.00 Flag question Question text An oil may be converted into a substance that is solid at room temperature by Select one: a. removing water, causing a dehydration synthesis reaction to occur b. adding hydrogens, decreasing the number of double bonds in the molecules c. removing hydrogens, increasing the number of double bondsd. cooling it, so that double bonds form and the fats solidify Question 7 Correct 1.00 points out of 1.00 Flag question Question text If you were to add olive oil to your food as part of a diet to lower your risk of atherosclerotic disease, you would use olive oil that Select one: a. is hydrogenated b. has lard added to it c. is modified to be solid at room temperature d. is liquid at room temperature Question 8 Correct 1.00 points out of 1.00 Flag question Question text DNA differs from RNA because DNA Select one: a. contains phosphate groups not found in RNA b. contains the sugar ribose rather than the sugar deoxyribose c. contains thymine in place of uracil d. consists of a single rather than a double polynucleotide strand Question 9 Correct 1.00 points out of 1.00Flag question Question text Which of the following substances is a lipid? Select one: a. steroids b. DNA c. enzymes d. cellulose Question 10 Correct 1.00 points out of 1.00 Flag question Question text The results of dehydration synthesis can be reversed by Select one: a. hydrolysis b. polymerization c. the addition of an amino group d. condensation Question 11 Correct 1.00 points out of 1.00 Flag questionQuestion text A diet high in animal products and hydrogenated vegetable margarine may increase the risk for atherosclerosis. This is because Select one: a. most animal fats are unsaturated and most hydrogenated vegetable margarines contain high levels of steroids b. most hydrogenated vegetable margarines are hydrogenated oils and most animal products contain high levels of phospholipids c. most animal fats are used for energy storage and most hydrogenated vegetable margarines contain high levels of unsaturated fats d. most animal fats are saturated and many hydrogenated vegetable margarines contain high levels of trans fats Question 12 Correct 1.00 points out of 1.00 Flag question Question text The molecular formula of most monosaccharides represents a multiple of Select one: a. cHO b. cH3O c. cHO2 d. cH2O Question 13 Correct 1.00 points out of 1.00 Flag question Question textWhat is the general function of enzymes within a cell? Select one: a. to stop chemical reactions b. to speed up chemical reactions c. to induce chemical reactions d. to promote the synthesis of monomers Question 14 Incorrect 0.00 points out of 1.00 Flag question Question text Which of the following statements regarding nucleotides is false? Select one: a. nucleotides contain nitrogenous bases b. nucleotides contain lipids c. nucleotides contain sugar molecules d. nucleotides can be linked together to form nucleic acids Question 15 Correct 1.00 points out of 1.00 Flag question Question text Which of the following functional groups is capable of regulating gene expression? Select one: a. oH b. cOOHc. cO d. cH3 Question 16 Correct 1.00 points out of 1.00 Flag question Question text Glucose molecules are to starch as ________ are to proteins. Select one: a. fatty acids b. amino acids c. monosaccharides d. oils Question 17 Correct 1.00 points out of 1.00 Flag question Question text Which of the following statements about dehydration synthesis is false? Select one: a. h2O is formed as the monomers are joined b. covalent bonds are formed between the monomers c. one monomer loses a hydrogen atom, and the other loses a hydroxyl group d. animal digestive systems utilize this process to break down food Question 18Correct 1.00 points out of 1.00 Flag question Question text Which of the following is a carboxyl group? Select one: a. nH2 b. oH c. cO d. cOOH Question 19 Correct 1.00 points out of 1.00 Flag question Question text Cows can derive nutrients from cellulose because Select one: a. their intestinal tract contains cellulose-hydrolyzing microorganisms b. they convert cellulose into starch, which is easily broken down in the intestinal tract c. they chew their food so thoroughly that cellulose fibers are broken down d. they produce the enzymes that break down cellulose Question 20 Correct 1.00 points out of 1.00Flag question Question text The storage form of carbohydrates is ________ in animals and ________ in plants. Select one: a. glycogen, starch b. cellulose, glycogen c. starch, glycogen d. glycogen, cellulose As cell size increases, the Select one: a. volume and surface area decrease b. surface area increases faster than the volume c. surface area and volume increase at the same rate d. volume increases faster than the surface area Question 2 Correct 1.00 points out of 1.00 Flag question Question text Which of the following statements regarding plasmodesmata is false? Select one: a. plasmodesmata are found in plants as well as some single-celled organismsb. plasmodesmata penetrate plant cell walls c. plasmodesmata carry nutrients between plant cells d. plasmodesmata carry chemical messages between plant cells Question 3 Correct 1.00 points out of 1.00 Flag question Question text Cyanide inhibits mitochondrial function; as a result, the rate of Select one: a. ATP synthesis decreases b. ATP synthesis increases c. photosynthesis increases d. protein synthesis increases Question 4 Correct 1.00 points out of 1.00 Flag question Question text Which of the following statements about cellular metabolism is false? Select one: a. Cellular metabolism often occurs on the surfaces of internal membranes b. Cellular metabolism includes different processes that require different conditions c. Cellular metabolism can occur within organelles d. Cellular metabolism occurs in animal but not plant cells Question 5Correct 1.00 points out of 1.00 Flag question Question text A manufacturing company dumps its wastes into a nearby pond. One of the wastes is found to paralyze the contractile vacuoles of certain protists. A biologist looking at individual samples of these organisms taken from the pond would find that they Select one: a. have lost water and shrunk b. have died because wastes have built up in the cytoplasm c. have gained water and burst d. have died of malnutrition Question 6 Correct 1.00 points out of 1.00 Flag question Question text The ________ cells lack a membrane enclosed nucleus. Select one: a. fungal b. prokaryotic c. plant d. eukaryotic Question 7 Correct 1.00 points out of 1.00Flag question Question text In the plasma membrane, the phospholipid heads Select one: a. are hydrophilic and face outward towards the aqueous solution on both sides of the membrane b. are hydrophobic and face inward, shielded from water c. are hydrophobic and face outward towards the aqueous solution on both sides of the membrane d. are hydrophilic and face inward, shielded from water Question 8 Correct 1.00 points out of 1.00 Flag question Question text Which of the following statements about cells is true? Select one: a. all cells have cell walls b. all cells are attached to other cells c. all cells are motile d. all cells have internal structures that move Question 9 Correct 1.00 points out of 1.00Flag question Question text Which of the following would be most affected by a mutation that prevented cells from forming tight junctions? Select one: a. attachment of the cytoskeleton to the inside of the plasma membrane b. integrity of the inner lining of the digestive tract c. direct flow of water and small molecules from one cell to another d. attachment of cells to the surrounding matrix Question 10 Incorrect 0.00 points out of 1.00 Flag question Question text Intermediate filaments Select one: a. guide the movements of organelles b. surround the nucleus c. guide the movements of chromosomes d. support the inner mitochondrial membrane Question 11 Incorrect 0.00 points out of 1.00 Flag questionQuestion text Which of the following cell structures is associated with the breakdown of harmful substances or substances that are no longer needed by the cell? Select one: a. peroxisomes b. chloroplasts c. mitochondria d. centrioles Question 12 Correct 1.00 points out of 1.00 Flag question Question text It is essential for heart muscle cells to beat in a coordinated fashion. The cell junctions that would best facilitate this are Select one: a. anchoring junctions b. tight junctions c. gap junctions d. occluding junctions Question 13 Incorrect 0.00 points out of 1.00 Flag question Question text Tay Sachs disease Select one:a. causes an accumulation of lipids in brain cells b. is due to the absence of an enzyme that digests polysaccharides c. involves damage to liver cells d. prevents the breakdown of glycogen Question 14 Correct 1.00 points out of 1.00 Flag question Question text A scanning electron microscope is used to study ________, whereas a transmission electron microscope is used to study ________. Select one: a. dead cells, live cells b. live cells, dead cells c. internal cell structures, cell surfaces d. cell surfaces, internal cell structures Question 15 Correct 1.00 points out of 1.00 Flag question Question text You are told that the cells on a microscope slide are plant, animal, or bacterial. You look at them through a microscope and see cell walls and membrane bound organelles. You conclude correctly that the cell Select one: a. are animal cellsb. are plant cells c. could be either plant or bacterial cells d. are bacterial cells Question 16 Correct 1.00 points out of 1.00 Flag question Question text Which organelle is involved in the catabolism of fatty acids and the detoxification of alcohol? Select one: a. smooth ER b. peroxosome c. golgi apparatus d. ribosomes Question 17 Correct 1.00 points out of 1.00 Flag question Question text Plasma membranes are permeable to Select one: a. small ions such as Na ion b. hydrophilic molecules such as glucose c. large hydrophilic molecules such as starchd. nonpolar molecules such as CO2 Question 18 Correct 1.00 points out of 1.00 Flag question Question text One centimeter equals ________ millimeters. Select one: a. 100 b. 10 c. 0.01 d. 0.10 Question 19 Correct 1.00 points out of 1.00 Flag question Question text Cilia differ from flagella in that Select one: a. cilia are anchored only in the proteins of the cell membrane, while flagella are anchored in a special structure called the basal body b. cilia contain nine microtubule doublets surrounding a central pair of microtubules, while flagella contain only nine microtubule doublets c. cilia are typically more numerous and shorter than flagella d. the protein filaments of cilia are naked, while those of flagella are wrapped in an extension of the cell membraneQuestion 20 Correct 1.00 points out of 1.00 Flag question Question text A scientist wants to magnify a pollen grain 8,000 times and examine the ridges and pores on its surface. Which one of the following instruments would be best? Select one: a. a fluorescence confocal microscope b. a scanning electron microscope c. a transmission electron microscope d. an inverted light microscope Question 1 Not answered Points out of 1.00 Flag question Question text A buffer Select one: a. donates H+ ions when conditions become too basic and accepts H+ ions when conditions become too acidic b. donates OH negative ions when conditions become too basic and accepts OH- ions when conditions become too acidic c. is an acid that is used to offset overly basic conditions in the body d. is a base that is used to offset overly acidic conditions in the bodyQuestion 2 Correct 1.00 points out of 1.00 Flag question Question text It is essential for heart muscle cells to beat in a coordinated fashion. The cell junctions that would best facilitate this are Select one: a. occluding junctions b. gap junctions c. anchoring junctions d. tight junctions Question 3 Correct 1.00 points out of 1.00 Flag question Question text Archaea are composed of ________ cells. Select one: a. animal b. bacteria c. eukaryoticd. prokaryotic Question 4 Correct 1.00 points out of 1.00 Flag question Question text In an ecosystem, energy Select one: a. typically flows from producers through a series of consumers b. cycles along with chemical nutrients c. comes ultimately from bacteria d. typically flows from consumers to producers to decomposers Question 5 Correct 1.00 points out of 1.00 Flag question Question text The extracellular matrix attached to cells via glycoproteins that then bind to _______ in the plasma membrane. Select one: a. polysaccharidesb. dynein c. integrins d. collagen Question 6 Correct 1.00 points out of 1.00 Flag question Question text A hypothesis is Select one: a. an explanatory idea that is broad in scope and supported by a large body of evidence b. a proposed explanation for a set of observations c. a widely accepted idea about a phenomenon d. the same as a theory Question 7 Correct 1.00 points out of 1.00 Flag question Question text A diet high in animal products and hydrogenated vegetable margarine may increase the risk for atherosclerosis. This is becauseSelect one: a. most animal fats are unsaturated and most hydrogenated vegetable margarines contain high levels of steroids b. most animal fats are saturated and many hydrogenated vegetable margarines contain high levels of trans fats c. most animal fats are used for energy storage and most hydrogenated vegetable margarines contain high levels of unsaturated fats d. most hydrogenated vegetable margarines are hydrogenated oils and most animal products contain high levels of phospholipids Question 8 Correct 1.00 points out of 1.00 Flag question Question text Which of the following statements about the domain Bacteria is true? Select one: a. all bacteria have a membrane-bound nucleus b. all bacteria lack a nucleus c. all bacteria are multicellular organisms d. archaea belong to this domain Question 9 Correct 1.00 points out of 1.00Flag question Question text The two main functions of the rough endoplasmic reticulum are the production of Select one: a. membrane and proteins secreted by the cell b. ribosomes and steroid hormones c. hydrogen peroxide and steroid hormones secreted by the cell d. mitochondria and proteins secreted by the cell Question 10 Correct 1.00 points out of 1.00 Flag question Question text The endosymbiosis hypothesis proposes that Select one: a. a small cell lived inside a larger cell to the benefit of both cells b. a large cell engulfed and digested a smaller cell, exposing its enzymes for use by the larger cell c. two cells merged into one cell, improving the enzyme function of the new cell d. two cells were juxtaposed and one benefited from the otherQuestion 11 Correct 1.00 points out of 1.00 Flag question Question text Microfilaments differ from microtubules in that microfilaments Select one: a. are mainly composed of actin, whereas microtubules are composed of tubulin b. are thicker than microtubules c. help to anchor organelles, whereas microtubules primarily function to help cells change shape and move d. are found only in plants, whereas microtubules are found in both plant and animal cells Question 12 Correct 1.00 points out of 1.00 Flag question Question text The ________ of a mitochondrion is/are an adaptation that increases the surface area and enhances a mitochondrion's ability to produce ATP. Select one: a. stroma b. cristaec. intermembrane space d. matrix Question 13 Correct 1.00 points out of 1.00 Flag question Question text Table salt is formed when Select one: a. sodium and chlorine share electrons to form a bond b. chlorine gives an electron to sodium c. sodium donates its single outer electron to chlorine d. a hydrogen bond forms between sodium and chlorine Question 14 Correct 1.00 points out of 1.00 Flag question Question text Which of the following statements about ecosystems is false? Select one: a. Plants and other photosynthetic organisms are producers in ecosystems b. Chemical nutrients cycle within an ecosystemc. In the process of energy conversions within an ecosystem, some energy is converted to heat d. bacteria and fungi recycle energy within an ecosystem Question 15 Correct 1.00 points out of 1.00 Flag question Question text The body uses atoms in different ways to accomplish different tasks. For example, one portion of the body's calcium supply strengthens bones, whereas another portion combines with proteins to stimulate blood clotting after tissue injury. Which of the statements that follow provides the most logical chemical explanation of calcium's ability to perform such different functions? Select one: a. the calcium in blood is a more reactive form of the atom and therefore has fewer protons than the calcium in bone b. there are many different isotopes of calcium, and the most reactive isotope is found in the bone c. the bone contains calcium salts, which are less reactive than the calcium ions found in the blood d. the calcium in blood has a lighter atomic mass than the calcium in bone and is in a more reactive form Question 16 Correct 1.00 points out of 1.00Flag question Question text If you eat a hamburger, you are mainly eating ground up beef muscle. What levels of organization are represented in this ground up muscle? Select one: a. organ, organ system, and organism b. organelle, cell, and tissue c. organism, population, and community d. tissue, organ, and organ system Question 17 Correct 1.00 points out of 1.00 Flag question Question text The sodium atom contains 11 electrons, 11 protons, and 12 neutrons. What is the mass number of sodium? Select one: a. 22 b. 23 c. 34 d. 11Question 18 Correct 1.00 points out of 1.00 Flag question Question text Structural proteins Select one: a. include ovalbumin, a protein found in egg white b. are found in hair and tendons c. include hemoglobin d. include receptor molecules Question 19 Correct 1.00 points out of 1.00 Flag question Question text In the equation 2 H2 + O2 is equal to 2 H2O, the H2 molecules are ________ and the H2O molecules are ________. Select one: a. created, destroyed b. reactants, productsc. used, stored d. products, reactants Question 20 Correct 1.00 points out of 1.00 Flag question Question text You notice that over the past month, many students on campus have started wearing a new style of school sweatshirt. You think to yourself that perhaps the bookstore has recently started selling this new sweatshirt style. This prediction is an example of Select one: a. a type of observation b. a hypothesis c. an experimental question d. an experiment Question 21 Correct 1.00 points out of 1.00 Flag question Question text The four most common elements in living organisms are Select one:a. c, H, O, N b. c, N, O, Na c. c, H, O, Na d. c, H, O, Fe Question 22 Correct 1.00 points out of 1.00 Flag question Question text Which of the following statements regarding plasmodesmata is false? Select one: a. plasmodesmata penetrate plant cell walls b. plasmodesmata are found in plants as well as some single-celled organisms c. plasmodesmata carry chemical messages between plant cells d. plasmodesmata carry nutrients between plant cells Question 23 Correct 1.00 points out of 1.00 Flag question Question text Which of the following statements about acid precipitation is false?Select one: a. acid precipitation is primarily the result of burning fossil fuels b. acid precipitation is defined as having a pH below 5.6 c. acid precipitation damages natural wilderness areas d. acid precipitation has little or no effect on soil chemistry Question 24 Correct 1.00 points out of 1.00 Flag question Question text To be scientifically valid, a hypothesis must be Select one: a. testable and falsifiable b. reasonable c. controlled d. part of a theory Question 25 Correct 1.00 points out of 1.00 Flag question Question textWhat happens to an atom if the electrons in the outer shell are altered? Select one: a. the properties of the atom will change b. the atom will disintegrate c. the atom's characteristics change and it becomes a different element d. the atom becomes radioactive Question 26 Correct 1.00 points out of 1.00 Flag question Question text Which of the following characteristics of protein will remain intact if the protein is denatured? Select one: a. the binding properties of the protein b. the number of amino acids in the protein c. the shape of the protein d. the function of the protein Question 27 Correct 1.00 points out of 1.00Flag question Question text The primary structure of a protein is Select one: a. maintained by hydrogen bonds b. an alpha helix or a pleated sheet c. the amino acid sequence of the polypeptide chain d. composed of two or more polypeptide chains Question 28 Correct 1.00 points out of 1.00 Flag question Question text A bacterial cells DNA is found in its Select one: a. ribosomes b. capsule c. nucleoid region d. nucleus Question 29 Correct1.00 points out of 1.00 Flag question Question text Lactose intolerance is the inability to Select one: a. digest cellulose b. produce lactose c. produce milk proteins d. digest lactose Question 30 Correct 1.00 points out of 1.00 Flag question Question text Which of the following statements about internal membranes in eukaryotic cells is false? Select one: a. in eukaryotic cells, internal membranes greatly increase a cell's total membrane area b. in eukaryotic cells, internal membranes standardize the internal environment of all cellular organelles c. in eukaryotic cells, internal membranes form membranous compartments called organellesd. in eukaryotic cells, internal membranes provide an additional area for many metabolic processes to occur Question 31 Correct 1.00 points out of 1.00 Flag question Question text Which of the following substances is a lipid? Select one: a. steroids b. DNA c. enzymes d. cellulose Question 32 Correct 1.00 points out of 1.00 Flag question Question text An antibiotic kills 99.9% of a bacterial population. You would expect the next generation of bacteria Select one: a. to be more resistant to that antibioticb. to die out due to the drastic decrease in population size c. to be more contagious than the prior generation d. to be just as susceptible to that antibiotic as was the previous generation Question 33 Correct 1.00 points out of 1.00 Flag question Question text Fatty acids with double bonds between some of their carbons are said to be Select one: a. saturated b. monoglycerides c. completely hyd d. unsaturated Question 34 Correct 1.00 points out of 1.00 Flag question Question text Which of the following cells has the greatest surface-to-volume ratio? Select one: a. ostrich eggb. bacterium c. human red blood cell d. human muscle cell Question 35 Correct 1.00 points out of 1.00 Flag question Question text Which of the following trace elements needed by humans is commonly added to table salt? Select one: a. iodine b. magnesium c. fluoride d. iron Question 36 Correct 1.00 points out of 1.00 Flag question Question text Which of the following statements regarding triglyceride molecules is false?Select one: a. triglycerides consist of three fatty acids attached to a glycerol b. triglycerides play a role in energy storage c. triglycerides are hydrophilic d. triglycerides are a type of fat Question 37 Correct 1.00 points out of 1.00 Flag question Question text Which of the following statements about genetics is true? Select one: a. each DNA molecule is a single strand of nucleotides b. genes are proteins that produce DNA c. differences among organisms reflect different nucleotide sequences in their DNA d. dna is made up of six different kinds of nucleotides Question 38 Correct 1.00 points out of 1.00 Flag question Question textIn the equation 2 H2 + O2 → 2 H2O, Select one: a. only H2O is a compound b. H2, O2, and H2O are all elements c. only H2 and O2 are compounds d. H2, O2, and H2O are all compounds Question 39 Correct 1.00 points out of 1.00 Flag question Question text Which of the following statements about cellular metabolism is false? Select one: a. Cellular metabolism occurs in animal but not plant cells b. Cellular metabolism can occur within organelles c. Cellular metabolism includes different processes that require different conditions d. Cellular metabolism often occurs on the surfaces of internal membranes Question 40 Correct 1.00 points out of 1.00 Flag questionQuestion text The nucleoid region of a prokaryotic cell Select one: a. contains the cell's DNA b. separates the RNA from the cytoplasm c. contains the cell's nucleoli d. is surrounded by a nucleoid membrane Question 41 Correct 1.00 points out of 1.00 Flag question Question text The ________ are weak bonds that are not strong enough to hold atoms together to form molecules but are strong enough to form bonds within and around large molecules. Select one: a. polar covalent bonds b. hydrogen bonds c. covalent bonds d. ionic bonds Question 42 Correct 1.00 points out of 1.00Flag question Question text Which of the following structures are used by prokaryotes for attaching to surfaces? Select one: a. capsule b. anchoring junctions c. flagella d. nucleoid Question 43 Correct 1.00 points out of 1.00 Flag question Question text Which of the following statements about anabolic steroids is false? Select one: a. they cause a general buildup of muscle mass b. they promote bone growth c. they often cause the body to reduce its normal output of sex hormones d. they can stimulate mood swings and violent behavior Question 44 Correct1.00 points out of 1.00 Flag question Question text Which of the following contains a carboxyl and an amino group? Select one: a. amino acids b. fats c. vinegar d. sugar Question 45 Incorrect 0.00 points out of 1.00 Flag question Question text Members of the kingdom Animalia Select one: a. can obtain their food by eating other organisms b. can obtain their food either by absorption or by photosynthesis c. are composed of cells that lack a cell membrane d. make their own food through photosynthesisQuestion 46 Correct 1.00 points out of 1.00 Flag question Question text Which of the following statements about lysosomes is false? Select one: a. lysosomes help to digest worn-out or damaged organelles b. lysosomes fuse with food vacuoles to expose nutrients to lysosomal enzymes c. lysosomes synthesize proteins from the recycled amino acids d. lysosomes destroy harmful bacteria engulfed by white blood cells Question 47 Correct 1.00 points out of 1.00 Flag question Question text Which of the following lists contains only polysaccharides? Select one: a. cellulose, starch, and glycogen b. starch, amino acids, and glycogen c. fructose, cellulose, and glucosed. sucrose, starch, and cellulose Question 48 Correct 1.00 points out of 1.00 Flag question Question text Which of the following cell structures is associated with the breakdown of harmful substances or substances that are no longer needed by the cell? Select one: a. chloroplasts b. centrioles c. peroxisomes d. mitochondria Question 49 Correct 1.00 points out of 1.00 Flag question Question text A scientist performs a controlled experiment. This means that Select one: a. the experiment proceeds at a slow pace to guarantee that the scientist can carefully observe all reactions and process all experimental data b. the experiment is repeated many times to ensure that the results are accuratec. two experiments are conducted, one differing from the other by only a single variable d. one experiment is performed, but the scientist controls the variables Question 50 Correct 1.00 points out of 1.00 Flag question Question text If you found a fossilized dinosaur bone, what method could be used to determine the age of the fossil? Select one: a. DNA fingerprinting b. isotope analysis c. radial immunodiffusion d. electrophoresis Question 51 Correct 1.00 points out of 1.00 Flag question Question text Which of the following statements about dehydration synthesis is false? Select one:a. covalent bonds are formed between the monomers b. h2O is formed as the monomers are joined c. animal digestive systems utilize this process to break down food d. one monomer loses a hydrogen atom, and the other loses a hydroxyl group Question 52 Correct 1.00 points out of 1.00 Flag question Question text One centimeter equals ________ millimeters. Select one: a. 0.01 b. 0.10 c. 100 d. 10 Question 53 Correct 1.00 points out of 1.00 Flag question Question text Mitochondria differ from chloroplasts in that mitochondriaSelect one: a. contain three different membrane bound compartments, whereas chloroplasts contain two b. are not found in plants, whereas chloroplasts are not found in animals c. contain membrane folds called cristae, whereas chloroplasts contain disk like vesicles in stacks called grana d. convert light energy from the sun to chemical energy, whereas chloroplasts convert one form of chemical energy to another Question 54 Correct 1.00 points out of 1.00 Flag question Question text A ________ forms when two atoms share electrons. Select one: a. covalent bond b. ionic bond c. hydrogen bond d. ion Question 55 Correct 1.00 points out of 1.00Flag question Question text The teeth of grain eating animals, such as horses, are usually broad and ridged. This makes the teeth suitable for grinding and chewing. Meat eating animals, such as lions, have pointed teeth that are good for puncturing and ripping flesh. This illustrates Select one: a. a result of natural selection as well as the connection between form and function b. a result of natural selection only c. a food web d. the connection between form and function only Question 56 Correct 1.00 points out of 1.00 Flag question Question text Which of the following statements is not consistent with Darwins theory of natural selection? Select one: a. individual organisms exhibit genetic change during their life spans to better fit their environment b. factors in the environment result in some organisms having better reproductive success than othersc. natural selection can lead to the appearance of new species d. individuals in a population exhibit variations, some of which are passed from parents to offspring Question 57 Correct 1.00 points out of 1.00 Flag question Question text An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. How many electrons does boron have? Select one: a. 15 b. 11 c. 2 d. 5 Question 58 Correct 1.00 points out of 1.00 Flag question Question text Which of the following statements about pH is true? Select one: a. basic pH levels are less than 7b. a single unit change on the pH scale is equivalent to a 1% change in hydrogen ion concentration c. the pH scale is a measure of oxygen ion concentration d. an increase in hydrogen ion concentration means a decrease in pH scale units Question 59 Correct 1.00 points out of 1.00 Flag question Question text Foods that are high in fiber are most likely derived from Select one: a. plants b. fish c. red meats d. dairy products Question 60 Correct 1.00 points out of 1.00 Flag question Question text Life is organized in a hierarchical fashion. Which of the following sequences correctly lists that hierarchy from least inclusive to most inclusive?Select one: a. organism, organ system, tissue, population, organ, organelle, community, cell, ecosystem, molecule b. molecule, organelle, cell, tissue, organ, organ system, organism, population, community, ecosystem c. ecosystem, population, organ system, cell, community, molecule, organ, organism, organelle, tissue d. cell, molecule, organ system, organ, organelle, population, tissue, organism, ecosystem, community Question 61 Incorrect 0.00 points out of 1.00 Flag question Question text Which of the following statements regarding nucleotides is false? Select one: a. nucleotides contain nitrogenous bases b. nucleotides contain sugar molecules c. nucleotides can be linked together to form nucleic acids d. nucleotides contain lipids Question 62 Correct 1.00 points out of 1.00Flag question Question text Consider the following statement: If all vertebrates have backbones, and turtles are vertebrates, then turtles have backbones. This statement is an example of Select one: a. a hypothesis b. deductive reasoning c. rationalization d. inductive reasoning Question 63 Correct 1.00 points out of 1.00 Flag question Question text The results of dehydration synthesis can be reversed by Select one: a. the addition of an amino group b. hydrolysis c. polymerization d. condensationQuestion 64 Correct 1.00 points out of 1.00 Flag question Question text All organisms belonging to the kingdom Plantae Select one: a. are multicellular and lack a nucleus b. obtain food by decomposing the remains of dead organisms and absorbing the nutrients c. are unicellular and lack a nucleus d. are photosynthetic Question 65 Correct 1.00 points out of 1.00 Flag question Question text The function of the nucleolus is Select one: a. to manufacture polypeptides b. to store chromatin c. intracellular digestiond. to manufacture ribosomal RNA Question 66 Correct 1.00 points out of 1.00 Flag question Question text The tertiary structure of a polypeptide refers to Select one: a. the presence of pleated sheets b. the amino acids of which it is made c. the overall three dimensional structure d. its size Question 67 Correct 1.00 points out of 1.00 Flag question Question text Organic compounds Select one: a. are synthesized only by animal cells b. always contain oxygenc. always contain carbon d. always contain nitrogen Question 68 Correct 1.00 points out of 1.00 Flag question Question text Which of the following statements regarding the oxygen atom of a water molecule is true? Select one: a. oxygen is more electronegative than the hydrogen atoms b. oxygen is attracted to the negatively charged atoms of other molecules c. oxygen is more positively charged than the hydrogen atoms d. oxygen attracts electrons less strongly than the hydrogen atoms Question 69 Correct 1.00 points out of 1.00 Flag question Question text The tendency of water molecules to stick together is referred to as Select one:a. transpiration b. adhesion c. polarity d. cohesion Question 70 Correct 1.00 points out of 1.00 Flag question Question text Glucose molecules are to starch as ________ are to proteins. Select one: a. monosaccharides b. amino acids c. fatty acids d. oils Question 71 Incorrect 0.00 points out of 1.00 Flag question Question text Most animal cells areSelect one: a. embedded in a lipid matrix b. attached to each other via plasmodesmata c. embedded in an extracellular matrix d. surrounded by a cell wall Question 72 Correct 1.00 points out of 1.00 Flag question Question text What is the fundamental difference between covalent and ionic bonding? Select one: a. covalent bonds form between atoms of the same element; ionic bonds form between atoms of different elements b. covalent bonding involves only the outermost electron shell; ionic bonding also involves the next electron shell inside the outermost shell c. in a covalent bond, the partners share a pair of electrons; in an ionic bond, one partner accepts electrons from the other d. in covalent bonding, both partners end up with filled outer electron shells; in ionic bonding, one partner does and the other does not Question 73 Correct 1.00 points out of 1.00Flag question Question text A theory is Select one: a. an idea that has been proven b. an explanation of an idea that is broad in scope and supported by a large body of evidence c. a concept in the early stages that still needs to be tested d. a description of a belief that invokes the supernatural Question 74 Correct 1.00 points out of 1.00 Flag question Question text Propanol and isopropanol are isomers. This means that they have Select one: a. the same molecular formula, but different chemical properties b. the same molecular formula, but represent different states of the compound c. different molecular formulas, but the same chemical properties d. the same molecular formula and the same chemical propertiesQuestion 75 Incorrect 0.00 points out of 1.00 Flag question Question text Water molecules stick to other water molecules because Select one: a. the oxygen atoms of adjacent water molecules are attracted to one another b. covalent bonds form between the hydrogen atoms of one water molecule and the oxygen atoms of other water molecules c. water molecules are neutral, and neutral molecules are attracted to each other d. hydrogen bonds form between the hydrogen atoms of one water molecule and the oxygen atoms of other water molecules Question 76 Correct 1.00 points out of 1.00 Flag question Question text Which of the following best represents an example of technology? Select one: a. sequencing the human genome b. identifying the cause of a new contagious diseasec. developing a test for genetic diseases d. figuring out what mountain gorillas eat Question 77 Correct 1.00 points out of 1.00 Flag question Question text What is the atomic mass of an atom that has 6 protons, 6 neutrons, and 6 electrons? Select one: a. 12 b. 6 c. 8 d. 18 Question 78 Correct 1.00 points out of 1.00 Flag question Question text The role of a control in an experiment is to Select one: a. ensure repeatabilityb. prove that a hypothesis is correct c. provide a basis of comparison to the experimental group d. counteract the negative effect of the experiment Question 79 Incorrect 0.00 points out of 1.00 Flag question Question text Protein synthesis requires the use of mRNA, which Select one: a. is made in the nucleolus b. carries the message to the nucleus to synthesize new DNA during cell division c. must be made by the ribosomes d. is translated by the ribosomes into the amino acid sequences of proteins Question 80 Correct 1.00 points out of 1.00 Flag question Question text The tree in your backyard is home to two cardinals, a colony of ants, a wasp's nest, two squirrels, and millions of bacteria. Together, all of these organisms representSelect one: a. an ecosystem b. a community c. a species d. a population Question 81 Incorrect 0.00 points out of 1.00 Flag question Question text A basal body is Select one: a. composed of nine microtubule triplets surrounding a central pair of microtubules b. identical in structure to cilia c. composed of nine microtubule doublets surrounding a central pair of microtubules d. similar in structure to centrioles Question 82 Correct 1.00 points out of 1.00 Flag questionQuestion text Which of the following functional groups is capable of regulating gene expression? Select one: a. cO b. oH c. cOOH d. cH3 Question 83 Incorrect 0.00 points out of 1.00 Flag question Question text Peptide bonds Select one: a. link amino acids b. form between fatty acids c. are used to form amino acids d. are formed by a hydrolysis reaction Question 84 Correct 1.00 points out of 1.00Flag question Question text Proteins cannot be denatured by Select one: a. changes in salt concentration b. freezing c. heat d. changes in pH Question 85 Correct 1.00 points out of 1.00 Flag question Question text Which of the following best describes the atomic number of an atom? Select one: a. the number of neutrons in the atom b. the number of protons in the atom c. the number of electrons in the atom d. the number of protons, electrons, and neutrons in the atom Question 86 Correct1.00 points out of 1.00 Flag question Question text A scanning electron microscope is used to study ________, whereas a transmission electron microscope is used to study ________. Select one: a. live cells, dead cells b. cell surfaces, internal cell structures c. dead cells, live cells d. internal cell structures, cell surfaces Question 87 Correct 1.00 points out of 1.00 Flag question Question text Your instructor asks you to look into your microscope to see a prokaryotic cell. You will be looking for a cell that Select one: a. makes up most of the tissues of your body b. has a nucleus c. has a membraned. is much larger than most cells in your body Question 88 Correct 1.00 points out of 1.00 Flag question Question text Kingdom Fungi includes species Select one: a. such as mushrooms and plants b. that obtain food by decomposing dead organisms and absorbing the nutrients c. that obtain food by ingestion d. that use photosynthesis to obtain food Question 89 Incorrect 0.00 points out of 1.00 Flag question Question text Why did the lactose tolerance mutation in the East African herders spread so rapidly within the population? Select one: a. milk provided calcium for strong bonesb. lactose was a better source of energy than glucose c. it was a selective advantage for survival during droughts d. milk was a good source of protein during the winter Question 90 Incorrect 0.00 points out of 1.00 Flag question Question text A manufacturing company dumps its wastes into a nearby pond. One of the wastes is found to paralyze the contractile vacuoles of certain protists. A biologist looking at individual samples of these organisms taken from the pond would find that they Select one: a. have gained water and burst b. have died of malnutrition c. have lost water and shrunk d. have died because wastes have built up in the cytoplasm Question 91 Incorrect 0.00 points out of 1.00 Flag question Question textIf you were to add olive oil to your food as part of a diet to lower your risk of atherosclerotic disease, you would use olive oil that Select one: a. is liquid at room temperature b. has lard added to it c. is hydrogenated d. is modified to be solid at room temperature Question 92 Correct 1.00 points out of 1.00 Flag question Question text Which of the following would be most affected by a mutation that prevented cells from forming tight junctions? Select one: a. attachment of the cytoskeleton to the inside of the plasma membrane b. attachment of cells to the surrounding matrix c. integrity of the inner lining of the digestive tract d. direct flow of water and small molecules from one cell to another Question 93 Incorrect 0.00 points out of 1.00Flag question Question text Clot formation in our blood can lead to a heart attack or stroke. What was altered in the proteins that made the clot? Select one: a. the blood was saturated with proteins b. the proteins became more polar c. the proteins became more soluble in the blood d. the proteins were no longer soluble in the blood Question 94 Correct 1.00 points out of 1.00 Flag question Question text Medicines are often administered in pill form. In many cases, the active ingredient of the pill (the drug) is joined to another substance by ________. This forms a ________, which is stable in the dry environment of a pill bottle but dissociates under the wet conditions of the digestive system to release the drug to the body. Select one: a. hydrogen bonds, base b. ionic bonds, salt c. covalent bonds, saltd. ionic bonds, acid Question 95 Not answered Points out of 1.00 Flag question Question text The ultimate source of energy flowing into nearly all ecosystems is Select one: a. sunlight b. electricity c. wind d. radioactivity Question 96 Incorrect 0.00 points out of 1.00 Flag question Question text Organisms that are prokaryotes are in the domains Select one: a. eukarya and Archaea b. fungi and Bacteria c. bacteria and Archaead. plantae and Animalia Question 97 Incorrect 0.00 points out of 1.00 Flag question Question text A water molecule (H O H) is held together by   Select one: a. hydrogen bonds b. a single covalent bond c. a double covalent bond d. two polar covalent bonds Question 98 Not answered Points out of 1.00 Flag question Question text What is the difference between a tissue and an organ system? Select one: a. tissues are not composed of cells; organ systems are composed of cells b. the tissue level of organization is more inclusive than the organ system levelc. a tissue cannot exist unless it is a component of an organ system, whereas an organ system can exist independently of tissues d. an organ system includes tissues Question 99 Not answered Points out of 1.00 Flag question Question text A disaccharide forms when Select one: a. two starches join by dehydration synthesis b. two starches join by hydrolysis c. two monosaccharides join by hydrolysis d. two monosaccharides join by dehydration synthesis Question 100 Not answered Points out of 1.00 Flag question Question text Radioactive isotopes Select one: a. are frequently added to foods as nutritional supplements b. are never incorporated into organic compoundsc. do not occur naturally d. can be used in conjunction with PET scans to diagnose diseases