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. Anything that occupies space and has mass is called
2. Which of the following is NOT an example of matter?
A. A brick
3. The simplest type of matter with unique physical and chemical properties is a(an)
4. Which element is found in the greatest abundance by weight in a human body?
5. Which of the following particles is NOT found in the nucleus of an atom?
D. All of the choices are found in the nucleus of an atom
6. Which subatomic particle is positively charged?
D. Protons and electrons
7. By definition, the atomic number is equal to the number of _____ an atom has.
8. Since an atom is electrically neutral, which two subatomic particles are equal in number?
A. Electrons and neutrons
B. Electrons and protons
C. Neutrons and protons
9. Which of the following is NOT true about isotopes?
A. Isotopes are two or more forms of the same element
B. Isotopes have different atomic numbers
C. Isotopes have different mass numbers
D. Some isotopes are radioactive
10. An atom that has more protons than electrons is called a(an)
11. A particle formed from the gain of electrons is called a(an)
12. An ionic bond is formed by the
A. Sharing of electrons between two atoms
B. Loss of electrons from two atoms
C. Attraction between cations and anions
D. Gain of electrons from two atoms
13. The symbol Mg
2+ means that a magnesium atom has
A. Gained two protons
B. Gained two electrons
C. Lost two protons
D. Lost two electrons
14. Which ion is NOT correctly matched to its function in the body?
A. Calcium – bones, teeth and muscle contraction
B. Sodium – membrane potentials and water balance
C. Iron – red blood cell formation
D. Chloride – acid-base balance
15. In a covalent bond, electrons are
A. Transferred between two atoms
B. Lost from two atoms
C. Shared between two atoms
D. Gained from two atoms
16. When electron pairs are shared equally between two atoms, what type of bond is formed?
A. Nonpolar covalent bond
B. Ionic bond
C. Polar covalent bond
D. Hydrogen bond
17. When electron pairs are unequally shared between two atoms, what type of bond is formed?
A. Nonpolar covalent bond
B. Ionic bond
C. Polar covalent bond
D. Hydrogen bond
18. The attraction between a positive hydrogen “end” of a polar molecule and the negative “end” of another
polar molecule is called a(an)
A. Ionic bond
B. Hydrogen bond
C. Nonpolar covalent bond
D. Polar covalent bond
19. What type of particle is formed from covalent bonds between two or more atoms?
A. A molecule
B. A compound
C. An ion
D. A mixture
20. Two or more different atoms that are chemically combined form a(an)
21. Which of the following is true of dissociation?
A. Molecules dissociate in water
B. Molecules come apart when dissolved in water
C. Ionic compounds come apart when dissolved in water
D. Water molecules can not surround ions in solution
22. Compounds that have the ability to conduct an electric current in solution are called
23. What type of reaction occurs when water is added to break down a large reactant into smaller products?
24. What type of reaction occurs when water is removed to add reactants together?
25. All the reactions in the body are collectively called
26. The type of energy found in chemical bonds is
A. Kinetic energy
B. Mechanical energy
C. Potential energy
D. Electrical energy
27. The energy molecule used to transfer energy in cells is called
28. Which of the following will NOT affect the rate of a chemical reaction?
A. Type of reactants
B. Concentration of reactants
D. Use of a catalyst
E. All of the choices will affect the rate of a chemical reaction
29. Which of the following will decrease the rate of a chemical reaction?
A. Increasing the concentration of reactants
B. Using a catalyst
C. Decreasing the temperature
D. Changing to a more reactive reactant
30. What will increase the rate of a reaction without being permanently changed itself?
A. A catalyst
B. An isotope
C. An acid
D. A base
31. A substance that will accept a proton is a(an)
32. What is the range for an acid on the pH scale?
A. 0 to 4
B. Less than 7.0
C. Greater than 7.0
D. 10 to 14
33. As the hydrogen ion concentration increases, the pH
C. Remains the same
34. What is the normal pH range for human blood?
B. 4.0 to 7.0
C. 7.35 to 7.45
D. 6.8 to 8.0
35. A chemical that resists change in pH is called a(an)
36. What is the function of oxygen in living cells?
A. To take energy from the food we eat to make ATP
B. To maintain the pH of the blood
C. A medium for chemical reactions
D. To transport nutrients in the blood
37. Which of the following is NOT an inorganic molecule?
A. Carbon dioxide
38. Which of the following is NOT a function of water in the body?
A. Transport of dissolved substances
B. Maintaining body temperature
C. Protection by lubricating body parts
D. Providing energy for cell reactions
39. What are the building blocks of carbohydrates?
B. Glycerol and fatty acids
C. Amino acids
40. Which of the following is NOT a polysaccharide of glucose?
41. Which of the following is NOT a function of carbohydrates in the body?
42. The most common of the fats in the body are
43. The building blocks of fats are
C. Cholesterol and fatty acids
D. Glycerol and fatty acids
44. Which type of fats do NOT contribute to the development of cardiovascular disease?
A. Polyunsaturated fats
B. Monounsaturated fats
C. Saturated fats
D. Diunsaturated fats
45. Which lipid group is NOT correctly matched to its function?
A. Eicosanoids – regulation
B. Fats – insulation
C. Phospholipids – stored energy
D. Steroids – bile salts for fat digestion
46. Which of the following is NOT true of phospholipids?
A. Make up cell membranes
B. Have two fatty acid chains
C. Have a polar end made of fatty acids
D. Have a nonpolar, hydrophobic end
47. Which of the following are NOT eicosanoids?
48. The building blocks of proteins are
A. Nucleic acids
B. Amino acids
C. Fatty acids
D. Linolenic acids
49. The sequence of amino acids joined by peptide bonds is the ______ structure of a protein.
50. The folding or bending of the polypeptide chain into an alpha-helix or beta-pleated sheet held by
hydrogen bonds is the _____ structure of a protein.
51. The folding of the folds of a polypeptide into distinct three-dimensional structures called domains is the
_______ structure of a protein.
52. Two or more proteins that join to form a functional unit is the ___________ structure of a protein.
53. Which of the following functions of proteins is NOT correctly matched to the example?
A. Structure – collagen as a framework
B. Protection – transport of substances in the blood
C. Regulation – enzymes controlling the rate of reactions
D. Energy – produce ATP
54. Which of the following is NOT a function of proteins in the body?
55. The destruction of the three-dimensional shape of a protein by heat or pH changes is called
56. A protein catalyst that increases the rate of a chemical reaction without being permanently changed is
57. Which of the following is NOT true of enzymes?
A. Lower activation energy for a reaction
B. Can be used for many reactants
C. Must fit like a lock and key to a reactant
D. Can be used over and over again
58. What are the building blocks of nuclei acids?
A. Amino acids
C. Fatty acids
59. Which of the following is NOT part of a nucleotide?
B. Nitrogenous organic base
C. Amino acid
60. Which of the following is NOT true about DNA?
A. Has the sugar deoxyribose
B. Is a double helix
C. Has the bases adenine, guanine, uracil and thymine
D. Two bases join to form the “rungs” of the double helix
61. The sequence of organic bases in DNA that codes for a protein is called a(an)
62. Which of the following is NOT true about RNA?
A. A single strand
B. Had three different forms
C. Has uracil instead of thymine
D. Is the hereditary molecule
63. The mass of an object changes with location, while weight stays constant.
64. The atom is the smallest particle of an element that has all the properties of that element.
65. The mass number of an isotope is equal to the protons plus neutrons.
66. Nonpolar covalent bonds between atoms can create a polar molecule.
67. A hydrogen bond is a chemical bond between atoms.
68. Hydrogen bonds are important in creating the three-dimensional shapes of large molecules.
69. All molecules are compounds.
70. In equilibrium of reversible reactions, the amounts of reactants and products are equal.
71. Within limits, the more concentrated the reactants, the slower a reaction will proceed.
72. An increase in temperature will increase the rate of a chemical reaction.
73. Alkalosis occurs when the pH of the blood drops below 7.35.
74. Most of the chemical reactions in the body would not take place if water were not present.
75. Lipids have important roles in regulating the rates of chemical reactions in the body.
76. There are 20 different amino acids.
77. Polar sections of a polypeptide chain tend to face outward toward water in helping to create the tertiary
structure of a protein.
78. The minimum amount of energy to start a chemical reaction is the activation energy.
79. Enzymes will raise the activation energy making it easier for a reaction to occur.
80. In DNA, the base adenine is the complement of thymine.