Biology 1010 Week 1 Quiz Exam Questions And Answers

The complete genetic makeup of an organism is called its - ANS genome Imagine that a scientist was able to take pictures of atoms and the position of their electrons. In one molecule, he found that the shared electron was around one atom 50% of the time and around the second atom 50% of the time. From this he concluded that these atoms shared what type of bond? - ANS nonpolar covalent Which of these is not a testable hypothesis? - ANS dogs are happier when they are walked regularly The chlorine atom has 17 electrons and the sodium atom has 11 electrons. These two atoms combine to form NaCl. After NaCl is ionized in water, how many electrons are in the chlorine ion? - ANS 18 If you could measure the charge coming from various parts of an atom, what charge would the nucleus have? - ANS positive An atom with 7 electrons in its outer shell will most likely bond with - ANS An atom with 1 electron in its outer shell. A researcher is examining swimming speed in goldfish. She uses a small net to individually catch 20 goldfish from a large tank of 100 and has them swim along a narrow raceway one at a time. She measures the swimming speed of each fish to determine the average swimming speed of a goldfish. All fish are held at the same temperature, were fed the same food, swim the same distance and were the same age and gender. What is wrong with her experiment? - ANS She did not use a random sample A researcher was interested in the impact of exercise on tumor growth in mice. She took 50 mice with tumors and had them walk each day on the treadmill for 6 weeks. All of the mice were fed the same diet, held under the same environmental conditions and required to walk the same amount on the treadmill. At the end of the experiment, she measured the size of their tumors. What is the biggest flaw in her experimental design? - ANS She lacks a control group The beaches at a nearby lake have been closed because of high E. coli counts. The lake is surrounded by agricultural areas and summer cottages. We know that different species of vertebrates have different E. coli strains in their digestive tracts. Which of the following represents a hypothesis for the source of the high E. coli counts? - ANS Runoff from dairy farms causes high E. coli counts In science, a theory should - ANS -be viewed as knowledge -be supported by a substantial body of evidence -provide the ability to make many correct predictions Macromolecules are polymers composed of monomers. For example polysaccharides like ___ are made of the repeating monomer ___. - ANS cellulose; glucose You are a medical examiner and are examining the brain tissue of someone who died at the age of 58. You find a large number of neurofibrillary tangles associated with hyperphosphorylated tau but no modified â-APP. From this you conclude that this individual - ANS Was likely a boxer and died due to Chronic Traumatic Encephalopathy A researcher is working with a molecule with the chemical formula C4H8. He notices that it does not always act the same in chemical reactions or within the cells he is testing. This difference in function is most likely because - ANS He has two different isomers of the molecule Sucrose is composed of one monomer of glucose and one monomer fructose. This means it is a - ANS disaccharide You are trying to identify a new molecule and you find it has the following characteristics, glycosidic bonds, adenine, uracil, guanine and ribose. This new molecule must be - ANS RNA How would you know if you have two molecules that are structural isomers of one another? - ANS They will have the same chemical formula but different bonding relationships Bonds between carbon and other atoms are relatively unstable and readily dissociate, resulting in the formation of new molecules (T/F) - ANS False Your lab partner is very excited because she has identified a new polymer! She wants to test your knowledge and so brings you the following list and says -"which one of these must be my new polymer type"? - ANS Protein Alkyl halides are chemical compounds often used in refrigerants as CFCs (chlorofluorocarbons). When water is added to alkyl halides, the chemical is then converted to a type of alcohol, which is generally safer for the environment. The process of making these CFC's safer is an example of - ANS hydrolysis The amino acid leucine does not dissolve well in water. This means that it likely has what type of side chain? - ANS nonpolar In microscopes, resolution is the - ANS ability to show two close objects as separate The structure of a chloroplast in a plant cell is best studied using a - ANS transmission electron microscope Which of the following statements about electron microscopes is true? - ANS Electron microscopes create a magnified image by focusing electron beams. These cytoskeletal filaments are necessary for muscle contraction and cytokinesis in animal cells. - ANS actin filaments The organelle that is responsible for the breakdown of toxins like alcohol is the - ANS smooth ER The nucleolus - ANS produces RNA for ribosomes The rough endoplasmic reticulum is described as "rough" because it has a lot of ______ embedded in the membrane. - ANS ribosomes Ribosomes are the structures in the cell that make - ANS proteins Tay-Sachs is caused by a lack of an enzyme that is necessary to break down lipids in nerve cells which leads to cell death and eventually death of the individual. The organelles in the nerve cells most likely to lack the proper enzyme needed for lipid breakdown are the - ANS lysosomes Which of the following are groups of organisms that are made of prokaryotic cells? - ANS Bacteria and archaea This membrane protein binds two or more ions or molecules and transports them in the same direction across a membrane. - ANS Symporter In our Ecstasy case study, Brittany was suffering from - ANS excess wate