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5 Written questions

5 Matching questions

  1. 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
  2. Which statement describes the currently accepted theory of how an enzyme and its substrate fit together?
    A. As the product is released, the enzyme breaks down.
    B. The enzyme is like a key that fits into the substrate, which is like a lock.
    C. The active site is permanently changed by its interaction with the substrate.
    D. As the substrate binds to the enzyme, the shape of the active site changes to accommodate the reaction.
  3. http://www.flickr.com/photos/60296733@N06/5513427923/
    In this pathway, B C is coupled with ADP ATP. Categorize the reactions as endergonic or exergonic.
    A. B C is endergonic and ADP ATP is exergonic.
    B. ADP ATP is endergonic and B C is exergonic.
    C. Both B C and ADP ATP are endergonic.
    D. Both B C and ADP ATP are exergonic.
  4. 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.
  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 B. ADP ATP is endergonic and B C is exergonic.
  2. b D. As the substrate binds to the enzyme, the shape of the active site changes to accommodate the reaction.
  3. c C. a nonprotein organic cofactor that interacts with an enzyme to allow it to work.
  4. d True
  5. e 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.

5 Multiple choice questions

  1. B. The reaction will continue, since the enzyme is not consumed by the reaction.
  2. A. five
  3. False
  4. A. ADP and phosphate.
  5. B. Second Law of Thermodynamics.

5 True/False questions

  1. http://www.flickr.com/photos/60296733@N06/5513974188/?edited=1
    In this reaction, the reactant (s) are _____________ and the coenzyme NAD is ____________.
    A. reduced; oxidized
    B. oxidized; oxidized
    C. reduced; reduced
    D. oxidized; reduced
    D. D refers to the product.

          

  2. If there are twelve different intermediate products produced in the stages for production of a molecule in a cell, we can expect that there
    A. is one enzyme that carries this process through to the end product.
    B. is one enzyme for degradation and another enzyme for synthesis.
    C. may not be any enzymes involved if this is a natural cell product.
    D. must be twelve different raw materials combined in the cell by one enzyme.
    E. are about twelve enzymes, at least one responsible for each step in the metabolic pathway.
    E. are about twelve enzymes, at least one responsible for each step in the metabolic pathway.

          

  3. Which form of energy is NOT correctly associated with the related example?
    A. kinetic energy: fat molecules
    B. kinetic energy: movement of muscles
    C. chemical energy: glucose
    D. potential energy: water held behind a dam
    E. potential energy: ATP
    A. kinetic energy: fat molecules

          

  4. In order to roll a rock down a hillside, you must first push it up out of the hole in which it rests. Pushing the rock is analogous to the energy of activation of a chemical reaction.
    True False
    True

          

  5. All of the biochemical pathways in a cell constitute
    A. coupling reactions.
    B. free energy.
    C. endergonic reactions only.
    D. exergonic reactions only.
    E. metabolism.
    E. metabolism.

          

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