Biology Chapter on Enzymes
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Questions and Answers

What is the primary function of enzymes in chemical reactions?

  • They decrease the activation energy required for the reaction. (correct)
  • They act as reactants in the reaction.
  • They increase the concentration of substrates.
  • They increase the temperature of the reaction.

    • In the lock-and-key model of enzyme action, how is the shape of the active site described?

  • Changing for each substrate.
  • Flexible and adapting.
  • Rigid and unchanging. (correct)
  • Variable depending on substrate concentration.

    • Which model of enzyme action allows for a greater range of substrate specificity?

  • Lock-and-Key Model.
  • Comparative Fit Model.
  • Induced Fit Model. (correct)
  • Basic Structure Model.

    • What occurs during the formation of the enzyme-substrate complex?

    <p>The enzyme and substrate form a transient complex.</p> Signup and view all the answers

    What environmental condition can be most detrimental to enzyme activity?

    <p>Extreme temperature.</p> Signup and view all the answers

    Which of the following factors does NOT affect enzyme activity?

    <p>Presence of other enzymes.</p> Signup and view all the answers

    What happens to the enzyme after it has catalyzed a reaction?

    <p>It can be reused for another substrate.</p> Signup and view all the answers

    What is the optimum pH range for most enzyme activity?

    <p>6 - 8.</p> Signup and view all the answers

    What defines an apoenzyme?

    <p>An enzyme without its non-protein moiety.</p> Signup and view all the answers

    What is required for the catalysis of chemical reactions by enzymes?

    <p>Specific substrates and active sites.</p> Signup and view all the answers

    Which of the following correctly describes a cofactor?

    <p>A non-protein component, either tightly or loosely bound to an enzyme.</p> Signup and view all the answers

    What is the function of the active site on an enzyme?

    <p>To bind specific substrates and facilitate catalysis.</p> Signup and view all the answers

    Which of the following describes the specificity of enzymes?

    <p>Enzymes can only catalyze reactions with certain substrates or bonds.</p> Signup and view all the answers

    What is the role of coenzymes?

    <p>They enhance enzyme activity and are loosely bound.</p> Signup and view all the answers

    What is activation energy?

    <p>The energy required to initiate a chemical reaction.</p> Signup and view all the answers

    Which statement about ribozymes is correct?

    <p>They are nucleic acid molecules acting as enzymes.</p> Signup and view all the answers

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