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5 Written Questions

5 Matching Questions

  1. While eating a container of yogurt, you have to leave, so you store the yogurt in the refrigerator. A day later you return and find the surface of the yogurt is no longer smooth but has broken into several liquified products. You correctly guess that enzymes from your saliva, via the spoon, have continued digesting the yogurt in your absence. What will happen over time?
    A. The reaction will soon stop because the amount of saliva is small, and you would have to add more saliva to continue the degradation.
    B. The reaction will continue, since the enzyme is not consumed by the reaction.
    C. The reaction will continue until half is digested and then stop because the reaction between substrate and product will be balanced.
    D. Absolutely no degradation of the yogurt will occur naturally unless in the presence of this enzyme.
  2. An enzyme is a globular protein that inhibits the formation of chemical bonds within the enzyme's substrate(s).
    True False
  3. Astrophysicists explain that eventually the sun will swell to become a red giant, engulf the earth and "burn out" with all forms of energy dispersing in a final "heat death." Compared with conditions today, the entropy of the universe then will
    A. have increased greatly.
    B. have decreased greatly.
    C. remain the same because energy cannot be created or destroyed.
  4. Feedback inhibition is the process that turns off an early enzyme in a metabolic pathway as the result of inhibitory actions of a product of the pathway.
    True False
  5. A coenzyme is
    A. an ionic cofactor that interacts with an enzyme to allow it to work.
    B. a protein cofactor that interacts with an enzyme to allow it to work.
    C. a nonprotein organic cofactor that interacts with an enzyme to allow it to work.
    D. an ionic cofactor that interacts with an enzyme to inhibit it.
    E. a protein cofactor that interacts with an enzyme to inhibit it.
  1. a False
  2. b A. have increased greatly.
  3. c C. a nonprotein organic cofactor that interacts with an enzyme to allow it to work.
  4. d B. The reaction will continue, since the enzyme is not consumed by the reaction.
  5. e True

5 Multiple Choice Questions

  1. B. Energy is not created nor destroyed, but it can change from one energy form to another.
  2. D. All of the choices are correct.
  3. A. the cellular energy expended in "thinking" must be less than the chemical bond energy supplied in food to these brain cells.
  4. C. Energy of reactants; Energy of products
  5. C. Eventually sunlight that is absorbed on the earth returns to space as dispersed heat.

5 True/False Questions

  1. What establishes the electrochemical gradient across a membrane to provide energy for ATP production?
    A. The chloroplast's electron transport system provides the ions.
    B. Hydrogen ions naturally collect on the outside of the organelle membrane.
    C. Hydrogen ions are pumped across the membrane by carrier proteins of the electron transport chain.
    D. All of the choices establish the electrochemical gradient.
    C. Hydrogen ions are pumped across the membrane by carrier proteins of the electron transport chain.

          

  2. If a change in pH alters an allosteric site where an inhibitor binds, but doesn't change the active site for the intended substrate, it would be possible for an enzymatically controlled reaction to occur as normal.
    True False
    True

          

  3. A living organism represents stored energy in the form of chemical compounds. When an organism dies, what happens to this stored energy?
    A. All chemicals immediately lose their high-energy bonds.
    B. All molecules immediately degrade into basic elements.
    C. All energy immediately leaves, and that is one manifestation that the organism is dead.
    D. The chemical compounds in cells lose their organization over time because there is no longer an input of energy to maintain the organized state.
    E. The chemical compounds remain exactly intact and ready to start up again unless digested by a consumer or decay organism.
    D. The chemical compounds in cells lose their organization over time because there is no longer an input of energy to maintain the organized state.

          

  4. Which best describes the second law of thermodynamics?
    A. Energy is not created nor destroyed, but it can change into matter.
    B. Energy is not created nor destroyed, but it can change from one energy form to another.
    C. Energy can be created from matter or used to produce matter.
    D. Some useful energy is lost as heat whenever an energy transfer occurs.
    E. Energy transfers are always 100% efficient in changing energy from one useful form to another.
    B. Energy is not created nor destroyed, but it can change from one energy form to another.

          

  5. Lactose is milk sugar, and humans produce substantial lactase enzyme to digest it when we are infants. However, we soon lose some or even all of our lactase after childhood. In such cases, undigested lactose passes to the lower intestine where bacteria break it down into lactic acid and CO2, causing painful gas bloating. This problem could be avoided by
    A. avoiding all dairy products containing lactose.
    B. taking lactase enzyme tablets when consuming lactose products.
    C. taking any enzyme tablets when consuming dairy products.
    D. consuming lactose in tablet form.
    E. Both taking lactase enzyme and avoiding all dairy products would be correct.
    C. a nonprotein organic cofactor that interacts with an enzyme to allow it to work.

          

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