HUM 1020 Structure & Function of the Body QUESTIONS AND ANSWERS

HUM 1020 Structure & Function of the Body QUESTIONS AND ANSWERS Chapter 2: Chemistry of Life MULTIPLE CHOICE Which of the following is not a subatomic particle that makes up the atom? a. ion b. proton c. neutron d. electron ANS: A DIF: Memorization REF: Page: 23 & 24 TOP: Atoms The atomic number of an atom is equal to the number of: a. electrons b. neutrons c. protons d. both B and C above ANS: C DIF: Memorization REF: Page: 24 TOP: Atoms The atomic mass of an atom is equal to the number of: a. electrons b. neutrons c. protons d. both B and C above ANS: D DIF: Memorization REF: Page: 24 TOP: Atoms This subatomic particle is found in the nucleus of the atom. a. electron b. neutron c. proton d. both B and C above ANS: D DIF: Memorization REF: Page: 24 TOP: Atoms This subatomic particle is found in orbitals around the nucleus of the atom. a. electron b. neutron c. proton d. both B and C above ANS: A DIF: Memorization REF: Page: 24 TOP: Atoms This is not a characteristic of a proton. a. Contributes to the atom’s atomic number b. Contributes to the atom’s atomic mass c. Is located in the nucleus of the atom d. Carries a negative electrical charge ANS: D DIF: Memorization REF: Page: 4 TOP: Atoms This is not a characteristic of a neutron. a. Contributes to the atom’s atomic number b. Contributes to the atom’s atomic mass c. Is located in the nucleus of the atom d. Has no electrical charge ANS: A DIF: Memorization REF: Page: 24 TOP: Atoms This is not a characteristic of an electron. a. Is in an orbital around the nucleus of the atom b. Has a negative electrical charge c. Contributes to the atom’s atomic number d. All of the above are characteristics of an electron ANS: C DIF: Memorization REF: Page: 24 TOP: Atoms A particular atom has 16 protons, 17 neutrons, and 16 electrons. The atomic number of this atom is: a. 49 b. 32 c. 33 d. 16 ANS: D DIF: Application REF: Page: 24 TOP: Atoms A particular atom has 16 protons, 17 neutrons, and 16 electrons. The atomic mass of this atom is: a. 49 b. 32 c. 33 d. 16 ANS: C DIF: Application REF: Page: 24 TOP: Atoms The second energy level of an atom: a. has four orbitals b. can hold eight electrons c. is a lower energy level then the first energy level d. both A and B above ANS: D DIF: Application REF: Page: 24 TOP: Atoms Compounds are: a. pure substances b. made up of only one type of atom c. made up of two or more different types of atoms d. both A and B above ANS: C DIF: Memorization REF: Page: 25 TOP: Elements, molecules, and compounds The formula for oxygen gas is O2, this means it is: a. made up of two atoms of oxygen b. a molecule c. a compound d. both A and B above ANS: D DIF: Application REF: Page: 25 TOP: Elements, molecules, and compounds If an atom had 20 protons and 18 electrons, it would: a. have a negative 2 charge b. have a plus 2 charge c. be attracted to a positively charged ion d. both A and C above ANS: B DIF: Application REF: Page: 25 TOP: Ionic bonds Ionic bonds: a. usually dissolve easily in water b. produced ions when dissolved in water c. are formed by atoms of opposite charge d. all of the above ANS: D DIF: Memorization REF: Page: 25 & 26 TOP: Ionic bonds Covalent bonds: a. dissociate in water b. are formed when electrons are shared between atoms c. are formed by atoms of opposite charge d. both A and C above ANS: B DIF: Memorization REF: Page: 26 TOP: Covalent bonds Organic compounds must contain: a. oxygen b. carbon-oxygen bonds c. carbon-hydrogen bonds d. none of the above ANS: D DIF: Memorization REF: Page: 27 TOP: Inorganic chemistry Which of the following is not true of water? a. Water is the most abundant organic compound in the body. b. Water is found both in and around the cells of the body. c. Water is the solvent in which most other compounds are dissolved. d. All of the above are true of water. ANS: A DIF: Memorization REF: Page: 27 & 28 TOP: Water In a dehydration synthesis reaction: a. water is a reactant b. water is a product c. a large molecule is broken down into a smaller one d. both A and C above ANS: B DIF: Memorization REF: Page: 27 & 28 TOP: Water In a dehydration synthesis reaction: a. hydrogen and oxygen are removed from the reactants b. water is added to the reactants c. water is broken down into hydrogen and oxygen d. both A and C above ANS: D DIF: Memorization REF: Page: 27 & 28 TOP: Water In a hydrolysis reaction: a. water is a product b. water is a reactant c. water is broken down into hydrogen and oxygen d. the product is larger than either reactant ANS: B DIF: Memorization REF: Page: 28 TOP: Water Which of the following statements is true? a. The process of hydrolysis is used to build a larger molecule from smaller molecules. b. Water is an end product of a hydrolysis reaction. c. The process of dehydration synthesis is used to build a larger molecule from smaller molecules. d. Water is a reactant in a dehydration synthesis reaction. ANS: C DIF: Memorization REF: Page: 27 & 28 TOP: Water Which is not true of the following chemical equation? K+ + Cl– ? KCl a. The equation indicates that there are two reactants. b. The equation indicates that there is one product. c. The equation indicates that the reaction occurs in both directions equally. d. All of the above are true. ANS: C DIF: Memorization REF: Page: 28 TOP: Inorganic chemistry An acid: a. has a pH greater than 7 b. has a pH less than 7 c. has more OH– ions than H+ ions in solution d. both A and C above ANS: B DIF: Memorization REF: Page: 29 TOP: Acids, bases, and salts A base: a. has a pH greater than 7 b. has a pH less than 7 c. has more OH– ions than H+ ions in solution d. both A and C above ANS: D DIF: Memorization REF: Page: 29 TOP: Acids, bases, and salts A solution with a pH of 6: a. is an acid b. is a base c. has 10 times more H+ ions than a solution with a pH of 5 d. both A and C above ANS: A DIF: Memorization REF: Page: 29 TOP: Acids, bases, and salts A solution with a pH of 11: a. is an acid b. is a base c. has 10 times more OH– ions than a solution with a pH of 10 d. both B and C above ANS: D DIF: Memorization REF: Page: 29 TOP: Acids, bases, and salts When the body removes CO2 by way of the respiratory system: a. it lowers the pH of the blood b. it raises the pH of the blood c. it has no effect on pH because CO2 is neither an acid nor a base d. it is acting as a buffer ANS: B DIF: Memorization REF: Page: 30 TOP: Acids, bases, and salts If a strong acid were added to one container of pure water and an equal amount of a weak acid were added to a second container of pure water: a. the pH of both containers would go up equally b. the pH of both containers would go down equally c. the pH of the container with the strong acid would go up more than the container with the weak acid d. none of the above ANS: D DIF: Application REF: Page: 29 & 30 TOP: Acids, bases, and salts Which of the following is a monosaccharide? a. glucose b. sucrose c. lactose d. glucagon ANS: A DIF: Memorization REF: Page: 31 TOP: Carbohydrates Which of the following is a disaccharide? a. glucose b. sucrose c. starch d. glycogen ANS: B DIF: Memorization REF: Page: 31 TOP: Carbohydrates Which of the following is a polysaccharide? a. glucose b. lactose c. sucrose d. glycogen ANS: D DIF: Memorization REF: Page: 31 TOP: Carbohydrates Liver cells and muscle cells are able to store chains of glucose in a molecule called: a. glycogen b. polyglucose c. sucrose d. lactose ANS: A DIF: Memorization REF: Page: 31 TOP: Carbohydrates Which of the following is not true of triglycerides? a. A part of the molecule attracts water. b. The molecule contains three fatty acids. c. The molecule contains glycerol. d. Triglycerides are used by the body to store energy. ANS: A DIF: Memorization REF: Page: 31 TOP: Lipids Which of the following is not true of phospholipids? a. The molecule contains three fatty acids. b. The molecule has a water-attracting part. c. The molecule has a water-repelling part. d. It is important in the structure of the cell membrane. ANS: A DIF: Memorization REF: Page: 33 TOP: Lipids Which of the following is not true of cholesterol? a. It is a steroid lipid. b. It helps stabilize the cell membrane. c. It contains only two fatty acids. d. It is the starting point for making the hormone estrogen. ANS: C DIF: Memorization REF: Page: 33 TOP: Lipids This lipid can be found in the cell membrane: a. triglycerides b. phospholipids c. cholesterol d. both B and C above ANS: D DIF: Memorization REF: Page: 33 TOP: Lipids Which of the following is a structural protein? a. hormones b. collagen c. growth factor d. enzymes ANS: B DIF: Memorization REF: Page: 34 TOP: Proteins The “lock and key” model is use to describe the functioning of: a. enzymes b. collagen molecules c. keratin molecules d. both A and B above ANS: A DIF: Memorization REF: Page: 34 & 35 TOP: Proteins Which of the following is not true of enzymes? a. They function on the lock and key model. b. They are functional proteins. c. They are catalysts. d. All of the above are true of enzymes. ANS: D DIF: Memorization REF: Page: 34 & 35 TOP: Proteins This molecule is found in DNA but not RNA: a. guanine b. thymine c. uracil d. adenine ANS: B DIF: Memorization REF: Page: 35 TOP: Nucleic acids This molecule is found in DNA but not RNA: a. adenine b. ribose sugar c. deoxyribose sugar d. phosphate ANS: C DIF: Memorization REF: Page: 35 TOP: Nucleic acids This molecule is found in RNA but not DNA: a. guanine b. thymine c. uracil d. adenine ANS: C DIF: Memorization REF: Page: 35 TOP: Nucleic acids This molecule is found in RNA but not DNA: a. ribose sugar b. deoxyribose sugar c. adenine d. cytosine ANS: A DIF: Memorization REF: Page: 35 TOP: Nucleic acids This subatomic particle does not contribute to the mass of an atom: a. proton b. neutron c. electron d. all of the above particles contribute to the mass of an atom ANS: B DIF: Memorization REF: Page: 24 TOP: Atoms The magnesium atom has 2 electrons in its outer energy level and is willing to donate both of them. The sodium atom has 7 electrons in its outer energy level and will accept 1 electron. The chemical formula for the compound formed by magnesium and sodium would be a. Mg2Na b. MgNa2 c. Mg2S d. MgS2 ANS: B DIF: Synthesis REF: Page: 25 TOP: Ionic Bonds Which of the following organs help maintain the proper pH of body fluids? a. kidneys by forming urine b. lungs by exhaling carbon dioxide c. spleen by filtering the blood d. both A and B above ANS: D DIF: Memorization REF: Page: 30 TOP: Acids, Bases and Salts Which of the following lipids do not contain fatty acids? a. phospholipids b. cholesterol c. triglycerides d. both A and B above ANS: B DIF: Memorization REF: Page: 33 TOP: Lipids Which of the following lipids are used as starting points in the making of hormones? a. phospholipids b. cholesterol c. triglycerides d. both B and C above ANS: B DIF: Memorization REF: Page: 33 TOP: Lipids Which metric unit is closest to a yard in the English system? a. kilometer b. meter c. centimeter d. millimeter ANS: B DIF: Memorization REF: Page: 31 TOP: Metric system Which metric unit is closest to an inch in the English system? a. kilometer b. meter c. centimeter d. millimeter ANS: C DIF: Memorization REF: Page: 31 TOP: Metric system Which of the following carries a positive electrical charge? a. proton b. neutron c. electron d. both proton and neutron ANS: A DIF: Memorization REF: Page: 24 TOP: Atoms Which of the following is found in the nucleus of the atom? a. proton b. neutron c. electron d. both proton and neutron ANS: D DIF: Memorization REF: Page: 24 TOP: Atoms Which of the following is found in orbitals surrounding the nucleus of the atom? a. proton b. neutron c. electron d. both proton and neutron ANS: C DIF: Memorization REF: Page: 24 TOP: Atoms Which of the following carries no electrical charge? a. proton b. neutron c. electron d. both proton and neutron ANS: B DIF: Memorization REF: Page: 24 TOP: Atoms Which of the following contributes to the atom’s atomic mass? a. proton b. neutron c. electron d. both proton and neutron ANS: D DIF: Memorization REF: Page: 24 TOP: Atoms Which of the following contributes to the atom’s atomic number? a. proton b. neutron c. electron d. both proton and neutron ANS: A DIF: Memorization REF: Page: 24 TOP: Atoms Which of the following carries a negative electrical charge? a. proton b. neutron c. electron d. both proton and neutron ANS: C DIF: Memorization REF: Page: 24 TOP: Atoms Which of the following contain three fatty acids and a molecule of glycerol? a. enzymes b. triglycerides c. phospholipids d. all of the above ANS: B DIF: Memorization REF: Page: 31 TOP: Lipids Which of the following is an example of a monosaccharide? a. glucose b. lactose c. glycogen d. starch ANS: A DIF: Memorization REF: Page: 31 TOP: Carbohydrates Which of the following has thymine as one of its nucleotides? a. DNA b. RNA c. both A and B above d. neither A nor B above ANS: A DIF: Memorization REF: Page: 35 TOP: Nucleic acids Which of the following is a lipid with a water-attracting and water-repelling part of its molecule? a. triglycerides b. cholesterol c. phospholipids d. none of the above ANS: C DIF: Memorization REF: Page: 33 TOP: Lipids Which of the following is an example of a structural protein? a. enzymes b. collagen c. glycogen d. none of the above ANS: B DIF: Memorization REF: Page: 34 TOP: Proteins Which of the following is an example of a functional protein? a. collagen b. glycogen c. enzymes d. none of the above ANS: C DIF: Memorization REF: Page: 34 TOP: Proteins Which of the following is a lipid that can be found along with cholesterol in the cell membrane? a. triglycerides b. phospholipids c. both A and B above d. neither A nor B above ANS: B DIF: Memorization REF: Page: 33 TOP: Lipids Which of the following is a nucleic acid with a double helix structure? a. DNA b. RNA c. both A and B above d. neither A nor B above ANS: A DIF: Memorization REF: Page: 36 TOP: Nucleic acids Which of the following is a protein whose function is explained by the lock and key model? a. collagen b. glycogen c. enzymes d. none of the above ANS: C DIF: Memorization REF: Page: 34 & 35 TOP: Proteins Which of the following has uracil as one of its nucleotides? a. DNA b. RNA c. both A and B above d. neither A nor B above ANS: B DIF: Memorization REF: Page: 35 TOP: Nucleic acids Which of the following is an example of a disaccharide? a. glucose b. dextrose c. glycogen d. lactose ANS: D DIF: Memorization REF: Page: 31 TOP: Carbohydrates Which of the following is a starting substance for making the hormones estrogen and testosterone? a. lactose b. collagen c. DNA d. cholesterol ANS: D DIF: Memorization REF: Page: 33 TOP: Lipids Which of the following acts as a chemical catalyst? a. DNA b. RNA c. enzymes d. phospholipids ANS: C DIF: Memorization REF: Page: 34 TOP: Proteins Which of the following is an example of a polysaccharide? a. glucose b. glycogen c. dextrose d. lactose ANS: B DIF: Memorization REF: Page: 31 TOP: Carbohydrates Which of the following is the steroid lipid? a. cholesterol b. triglycerides c. enzymes d. phospholipids ANS: A DIF: Memorization REF: Page: 33 TOP: Lipids TRUE/FALSE Matter can be defined as anything that occupies space and has mass. ANS: T DIF: Memorization REF: Page: 23 TOP: Levels of chemical organization Atoms have never been seen by scientists, but their presence is strongly supported by the atomic theory. ANS: F DIF: Memorization REF: Page: 23 TOP: Atoms The proton of the atom carries a positive electrical charge. ANS: T DIF: Memorization REF: Page: 24 TOP: Atoms The proton of the atom is found in orbitals around the nucleus. ANS: F DIF: Memorization REF: Page: 24 TOP: Atoms The proton of an atom is found in the nucleus. ANS: T DIF: Memorization REF: Page: 24 TOP: Atoms An atom with 15 protons would have an atomic mass of 15. ANS: F DIF: Application REF: Page: 24 TOP: Atoms An atom with 15 protons would have an atomic number of 15. ANS: T DIF: Application REF: Page: 24 TOP: Atoms An atom with 15 protons and 15 electrons would have an atomic mass of 30. ANS: F DIF: Application REF: Page: 24 TOP: Atoms An atom with 15 protons and 15 neutrons would have an atomic mass of 30. ANS: T DIF: Application REF: Page: 24 TOP: Atoms Neutrons have no electrical charge. ANS: T DIF: Memorization REF: Page: 24 TOP: Atoms Neutrons and electrons are found in the nucleus of the atom. ANS: F DIF: Memorization REF: Page: 24 TOP: Atoms Neutrons contribute to the atomic number of an atom. ANS: F DIF: Memorization REF: Page: 24 TOP: Atoms Neutrons contribute to the atomic mass of the atom. ANS: T DIF: Memorization REF: Page: 24 TOP: Atoms Electrons carry a negative electrical charge. ANS: T DIF: Memorization REF: Page: 24 TOP: Atoms The number of electrons plus the number of protons is equal to the atomic number of an atom. ANS: F DIF: Memorization REF: Page: 24 TOP: Atoms All orbitals of an atom can hold two electrons. ANS: T DIF: Memorization REF: Page: 24 TOP: Atoms All energy levels of an atom can hold four orbitals. ANS: F DIF: Memorization REF: Page: 24 TOP: Atoms All energy levels can hold eight electrons. ANS: F DIF: Memorization REF: Page: 24 TOP: Atoms The first energy level of an atom can hold only two orbitals. ANS: F DIF: Memorization REF: Page: 24 TOP: Atoms The first energy level of an atom is closest to the nucleus and is the lowest energy level. ANS: T DIF: Memorization REF: Page: 24 TOP: Atoms The terms energy level and electron orbital are interchangeable. ANS: F DIF: Memorization REF: Page: 24 TOP: Atoms Elements are pure substances. ANS: T DIF: Memorization REF: Page: 24 TOP: Elements, molecules, and compounds The terms molecule and compound are interchangeable. ANS: F DIF: Memorization REF: Page: 25 TOP: Elements, molecules, and compounds A formula of a compound tells you the number and types of elements that make up that compound. ANS: T DIF: Memorization REF: Page: 25 TOP: Elements, molecules, and compounds The elements sodium, oxygen, hydrogen, and nitrogen make up 96% of the human body. ANS: F DIF: Memorization REF: Page: 24 TOP: Elements, molecules, and compounds An atom is said to be chemically stable when its outer energy level is full. ANS: T DIF: Memorization REF: Page: 25 TOP: Chemical bonding An atom with one more electron than proton would have a plus one charge. ANS: F DIF: Application REF: Page: 25 & 26 TOP: Ionic bonds In order for an atom to be an ion, the number of electrons cannot equal the number of protons. ANS: T DIF: Application REF: Page: 25 TOP: Ionic bonds When ionic compounds dissolve in water, they tend to dissociate into ions. ANS: T DIF: Memorization REF: Page: 25 TOP: Ionic bonds Molecules that form ions when dissolved in water are called electrolytes. ANS: T DIF: Memorization REF: Page: 25 TOP: Ionic bonds The symbol for a sodium atom that has lost one electron would be Na. ANS: F DIF: Application REF: Page: 25 & 26 TOP: Ionic bonds The symbol for a sodium atom that has lost one electron would be Na+. ANS: T DIF: Application REF: Page: 25 & 26 TOP: Ionic bonds Atom X has eight electrons, two in its first energy level and six in its second energy level. It would most likely form an ion with a plus 2 charge. ANS: F DIF: Synthesis REF: Page: 25 & 26 TOP: Ionic bonds Covalent bonds do not usually dissociate in water. ANS: T DIF: Memorization REF: Page: 26 TOP: Covalent bonds Covalent bonds dissociate into ions when dissolved in water. ANS: F DIF: Memorization REF: Page: 26 TOP: Covalent bonds All compounds in the human body are, by definition, organic compounds. ANS: F DIF: Memorization REF: Page: 27 TOP: Inorganic chemistry Organic compounds must have either a C-C or C-H bond. ANS: T DIF: Memorization REF: Page: 27 TOP: Inorganic chemistry Water is an inorganic compound. ANS: T DIF: Memorization REF: Page: 27 TOP: Water Aqueous solutions have water as the solvent. ANS: T DIF: Memorization REF: Page: 27 TOP: Water In a dehydration synthesis reaction, water is always a reactant. ANS: F DIF: Memorization REF: Page: 27 & 28 TOP: Water In a dehydration synthesis reaction, water is always a product. ANS: T DIF: Memorization REF: Page: 27 & 28 TOP: Water In dehydration synthesis reaction, smaller reactants are joined to form a larger product. ANS: T DIF: Memorization REF: Page: 28 TOP: Water In the process of hydrolysis, a molecule of water is broken down to hydrogen and oxygen. ANS: F DIF: Memorization REF: Page: 28 TOP: Water In hydrolysis, water is used to break the bonds of a larger molecule and convert it to smaller molecules. ANS: T DIF: Memorization REF: Page: 28 TOP: Water In a hydrolysis reaction, water is always an end product. ANS: F DIF: Memorization REF: Page: 28 TOP: Water Hydrolysis is virtually the reverse of a dehydration synthesis reaction. ANS: T DIF: Memorization REF: Page: 28 TOP: Water Acids produce an excess of H+ ions. ANS: T DIF: Memorization REF: Page: 29 TOP: Acids, bases, and salts Bases produce an excess of OH– ions. ANS: T DIF: Memorization REF: Page: 29 TOP: Acids, bases, and salts An increase in H+ ions will cause an increase in the pH value. ANS: F DIF: Memorization REF: Page: 29 TOP: Acids, bases, and salts An increase in pH value would mean more H+ ions are in solution. ANS: F DIF: Application REF: Page: 29 TOP: Acids, bases, and salts A solution with a pH of 4 has 100 times more H+ ions than a solution with a pH of 2. ANS: F DIF: Application REF: Page: 29 TOP: Acids, bases, and salts A solution with a pH of 3 has 10 times more H+ ions than a solution with a pH of 4. ANS: T DIF: Application REF: Page: 29 TOP: Acids, bases, and salts A solution that has a greater concentration of OH– ions than H+ ions would be called a base. ANS: T DIF: Memorization REF: Page: 29 TOP: Acids, bases, and salts A strong acid added to a solution would raise the pH more than the same amount of a weak acid added to the solution. ANS: F DIF: Application REF: Page: 29 & 30 TOP: Acids, bases, and salts When a neutralization reaction occurs between a strong acid and base, one of the end products is water. ANS: T DIF: Memorization REF: Page: 30 TOP: Acids, bases, and salts A buffer is a chemical that helps prevent a sudden change in pH. ANS: T DIF: Memorization REF: Page: 30 TOP: Acids, bases, and salts The word “carbohydrate” literally means “sugar.” ANS: F DIF: Memorization REF: Page: 31 TOP: Carbohydrates Both sucrose and lactose are monosaccharides. ANS: F DIF: Memorization REF: Page: 31 TOP: Carbohydrates Glucose is used by the body as a source of energy. ANS: T DIF: Memorization REF: Page: 31 TOP: Carbohydrates Both sucrose and lactose are disaccharides. ANS: T DIF: Memorization REF: Page: 31 TOP: Carbohydrates A molecule of glycogen contains more saccharide units than a molecule of sucrose. ANS: T DIF: Application REF: Page: 31 TOP: Carbohydrates A molecule of glucose has more saccharide units than a molecule of lactose. ANS: F DIF: Application REF: Page: 31 TOP: Carbohydrates Muscles store chains of glucose in a molecule called dextrose. ANS: F DIF: Memorization REF: Page: 31 TOP: Carbohydrates Glycogen and starch are both polysaccharides. ANS: T DIF: Memorization REF: Page: 31 TOP: Carbohydrates Cholesterol is an important source of energy for the body. ANS: F DIF: Memorization REF: Page: 31 & 33 TOP: Lipids Phospholipids and triglycerides both contain fatty acids. ANS: T DIF: Memorization REF: Page: 33 TOP: Lipids Phospholipids and triglycerides both have parts of their molecules that attract water. ANS: F DIF: Memorization REF: Page: 33 TOP: Lipids Phospholipids are the starting substance for several steroid hormones in the body. ANS: F DIF: Memorization REF: Page: 33 TOP: Lipids Both phospholipids and cholesterol are structural components of the cell membrane. ANS: T DIF: Memorization REF: Page: 33 TOP: Lipids Both phospholipids and cholesterol are steroid lipids. ANS: F DIF: Memorization REF: Page: 33 TOP: Lipids The bonds that join amino acids together to form a protein are called peptide bonds. ANS: T DIF: Memorization REF: Page: 34 TOP: Proteins The functional proteins in the body include hormones, collagen, and cell membrane receptors. ANS: F DIF: Memorization REF: Page: 34 TOP: Proteins The shape of proteins determines their role in body chemistry. ANS: T DIF: Memorization REF: Page: 34 TOP: Proteins The basic building blocks of nucleic acids are nucleotides. ANS: T DIF: Memorization REF: Page: 35 TOP: Nucleic acids Both DNA and RNA contain uracil. ANS: F DIF: Memorization REF: Page: 35 TOP: Nucleic acids Both DNA and RNA contain a sugar molecule as part of their structure. ANS: T DIF: Application REF: Page: 35 TOP: Nucleic acids Both DNA and RNA have a double helix structure. ANS: F DIF: Memorization REF: Page: 35 & 36 TOP: Nucleic acids DNA is the “master code” for making proteins. ANS: T DIF: Memorization REF: Page: 36 TOP: Nucleic acids LDLs have a high concentration of protein and low concentration of lipid. ANS: F DIF: Memorization REF: Page: 35 TOP: Blood lipoproteins HDL is sometimes called the “bad” cholesterol. ANS: F DIF: Memorization REF: Page: 35 TOP: Blood lipoproteins LDL is sometimes called the “bad” cholesterol. ANS: T DIF: Memorization REF: Page: 35 TOP: Blood lipoproteins High levels of LDL are associated with the development of atherosclerosis. ANS: T DIF: Memorization REF: Page: 35 TOP: Blood lipoproteins An atom’s mass number is usually greater than its atomic number. ANS: T DIF: Application REF: Page: 24 TOP: Atoms An atom’s atomic number is usually greater than its mass number. ANS: F DIF: Application REF: Page: 24 TOP: Atoms Electrons move in an elliptical orbit rather than a circular orbit around the nucleus. ANS: F DIF: Memorization REF: Page: 24 TOP: Atoms An electron in the third energy level is closer to the nucleus than an electron in the second energy level. ANS: F DIF: Memorization REF: Page: 24 TOP: Atoms All compounds are molecules, but not all molecules are compounds. ANS: T DIF: Application REF: Page: 24 & 25 TOP: Elements, molecules, and compounds