Chapter 2 Chemistry Comes Alive (TB)

  1. Which of the following is necessary for proper conduction of nervous impulses? 

    D) Na
  2. A phospholipid is usually ________. 

    A) partially polar and partially nonpolar
  3. In general, the category of lipids that we refer to as oils have ________.

    A) a high degree of unsaturated bonds
  4. The genetic information is coded in DNA by ________. 

    A) the sequence of the nucleotides
  5. Which of the following is not true of proteins? 

    B) They appear to be the molecular carriers of the coded hereditary information.
  6. The single most abundant protein in the body is ________. 

    D) collagen
  7. Carbohydrates are stored in the liver and muscles in the form of ________. 

    C) glycogen
  8. Coenzymes are ________. 

    D) organic molecules derived from vitamins
  9. The speed or rate of a chemical reaction is influenced by all of the following except ________. 

    D) the presence or absence of carbon
  10. A chemical reaction in which bonds are broken is usually associated with ________. 

    D) the release of energy
  11. Salts are always ________. 

    A) ionic compounds
  12. The numbers listed represent the first, second, and third energy levels, respectively. On this basis, which of the following is an unstable or reactive atom? 

    B) 2, 8, 1
  13. A solution that has a pH of 2 could best be described as being ________. 

    D) acidic
  14. Which of the following is the major positive ion outside cells? 

    D) sodium
  15. Which of the following would be regarded as an organic molecule? 

    D) CH4
  16. A chain of 25 amino acids would be called a ________. 

    A) polypeptide
  17. A long chain of simple sugars would be a ________. 

    A) polysaccharide
  18. The coiling of the protein chain backbone into an alpha helix is referred to as the ________. 

    A) secondary structure
  19. Carbohydrates and proteins are built up from their basic building blocks by the ________. 

    A) removal of a water molecule between each two units
  20. Which statement about enzymes is false? 

    D) Enzymes raise the activation energy needed to start a reaction.
  21. Many plasma proteins may function as _________. 

    C) buffers
  22. Which of the following is true regarding the concentration of solutions? 

    D) Molarity is one mole of solute per 1000 ml of solution.
  23. Select the statement about mixtures that is correct. 

    D) A solution contains solvent in large amounts and solute in smaller quantities.
  24. HCO3- is _________. 

    B) a bicarbonate ion
  25. Select which reactions will usually be irreversible regarding chemical equilibrium in living systems. 

    C) glucose to CO2 & H2O
  26. In redox reactions ________. 

    A) both decomposition and electron exchange occur
  27. Fibrous proteins ________. 

    A) are very stable and insoluble in water
  28. The ATP molecule is not used in ___________. 

    A) pigments
  29. Select the most correct statement regarding nucleic acids. 

    B) DNA is a long, double-stranded molecule made up of A, T, G, and C bases.
  30. ________ is a suspension. 

    C) Blood
  31. Select the correct statement about isotopes. 

    A) Isotopes of the same element have the same atomic number but differ in their atomic mass.
  32. The four elements that make up about 96% of body matter are ________. 

    C) carbon, oxygen, hydrogen, nitrogen
  33. An example of a coenzyme is ________.

    C) riboflavin (vitamin B2)
  34. ________ is fat-soluble, produced in the skin on exposure to UV radiation, and necessary for normal bone growth and function. 

    D) Vitamin D
  35. In liquid XYZ, you notice that light is scattered as it passes through. There is no precipitant in the bottom of the beaker, though it has been sitting for several days. This liquid must be a ________. 

    C) colloid
  36. Atom X has seventeen protons. How many electrons are in its valence shell? 

    D) 7
  37. If an atom were to have two protons, then it would ________. 

    C) be very stable
  38. If atom X has an atomic number of 74 it would have ________. 

    A) 74 protons and roughly the same number of neutrons
  39. The formula C6H12O6 means ________. 

    C) there are 12 hydrogen, 6 carbon, and 6 oxygen atoms
  40. Two good examples of a colloid would be Jell-O® or ________. 

    D) cytosol
  41. An atom with a valance of 3 may have a total of ________ electrons. 

    C) 13
  42. An atom with ________ electrons could be an anion when ionically bonded. 

    C) 9
  43. The chemical symbol O=O means ________.

    C) the atoms are double bonded
  44. Dipole is ________. 

    C) a polar molecule
  45. CH4 means ________. 

    B) there is one carbon and four hydrogen atoms
  46. Amino acids joining together to make a peptide is a good example of a ________ reaction. 

    C) synthesis
  47. ________ is not considered to be a factor in influencing a reaction. 

    C) Time
  48. Which of the following is not an electrolyte? 

    C) H2O
  49. Human blood has a pH of ________. 

    B) 7.35-7.45
  50. __________ is a heavy metal normally found in the body. 

    C) Iron
  51. Sucrose is a ________.

    C) disaccharide
  52. Neutral fats have a ________ ratio of fatty acids to glycerol. 

    B) 3:1
  53. In a DNA molecule, the phosphate serves ________. 

    D) to hold the molecular backbone together
  54. Most fibrous proteins in the body contain all of these except: 

    C) eledin
  55. Heat shock proteins (hsp) are a type of protein called ________. 

    C) chaperonins
  56. _________ bonds often bind different parts of a molecule into a specific 3-dimensional shape. 

    A) Hydrogen
  57. Choose the statement that is false or incorrect.

    B) A key feature of the body's metabolism is the almost exclusive use of exergonic reactions by the body.
  58. Which of the following is not a role of molecular chaperonins?

    E) act as a biological catalyst
  59. Which of the following statements is false?

    A) Larger particles move faster than smaller ones and thus collide more frequently and more forcefully.
  60. Which protein types are vitally important to cell function in all types of stressful circumstances?

    C) molecular chaperones
  61. Which property of water is demonstrated when we sweat?

    C) high heat of vaporization
  62. The atomic number is equal to the number of ________.
    protons (and electrons)
  63. Molecules such as methane that are made of atoms that share electrons have ________ bonds.
  64. An atom with three electrons would have a valence of ________.
  65. AB → A + B is an example of a(n) ________ reaction.
  66. ________ have a bitter taste, feel slippery, and are proton acceptors.
  67. A holoenzyme is composed of an apoenzyme and a(n) ________.
  68. In a DNA molecule, guanine would connect to ________.
  69. The ________ molecule directly provides energy for cellular work.
  70. Hydrogen bonds are more like a type of weak ________ than true bonds.
  71. Weak acids and bases make good ________.
  72. Starch is the stored carbohydrate in plants, while ________ is the stored carbohydrate in animals.
  73. How many phosphates would AMP have attached to it?
  74. Which metals have a toxic effect on the body?
  75. The atomic weight is only an average of relative weights of an atom and its isotopes, and it may vary from the weight of a specific isotope. True or False
  76. Emulsions and colloids are the same thing. True or False
  77. Chemical properties are determined primarily by neutrons. True or False
  78. A charged particle is generally called an ion. True or False
  79. Isotopes differ from each other only in the number of electrons contained. True or False
  80. About 60 to 80% of the volume of most living cells consists of organic compounds. True or False
  81. Lipids are a poor source of stored energy. True or False
  82. Current information theorizes that Omega-3 fatty acids decrease the risk of heart disease. True or False
  83. Glucose is an example of a monosaccharide. True or False
  84. A molecule consisting of one carbon atom and two oxygen atoms is correctly written as CO2. True or False
  85. The lower the pH, the higher the hydrogen ion concentration. True or False
  86. Covalent bonds are generally less stable than ionic bonds. True or False
    False; more
  87. Hydrogen bonds are comparatively strong bonds. True or False
    False; weak
  88. The fact that no chemical bonding occurs between the components of a mixture is the chief difference between mixtures and compounds. True or False
  89. Alpha particles, although relatively weak energy particles, are second only to smoking as a cause of lung cancer. True or False
  90. No chemical bonding occurs between the components of a mixture. True or False
  91. All organic compounds contain carbon. True or False
  92. A dipeptide can be broken into two amino acids by dehydration synthesis. True or False
    False; hydration
Card Set
Chapter 2 Chemistry Comes Alive (TB)
Biology 103A