Enzymes in Biochemistry Quiz
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Questions and Answers

What is the role of a cofactor in an enzyme-catalyzed reaction?

  • The cofactor binds to the enzyme and prevents the reaction from occurring.
  • The cofactor is the substrate that the enzyme acts upon.
  • The cofactor is a metal ion or organic molecule that is needed for the enzyme-catalyzed reaction to take place. (correct)
  • The cofactor is a byproduct released after the enzyme-catalyzed reaction has occurred.

    • What is the difference between the lock-and-key model and the induced-fit model of enzyme specificity?

  • The lock-and-key model states that the enzyme-substrate complex is formed through covalent bonds, while the induced-fit model states that the complex is formed through non-covalent interactions.
  • The lock-and-key model states that the substrate must exactly match the shape of the active site, while the induced-fit model states that the active site can adjust to fit a variety of substrate shapes. (correct)
  • The lock-and-key model states that the active site is rigid, while the induced-fit model states that the active site is flexible.
  • The lock-and-key model states that the enzyme must be activated by a cofactor, while the induced-fit model states that the enzyme can function without a cofactor.

    • What is the difference between a competitive inhibitor and a noncompetitive inhibitor?

  • A competitive inhibitor is a substrate, while a noncompetitive inhibitor is a product of the enzyme-catalyzed reaction.
  • A competitive inhibitor increases the enzyme's activity, while a noncompetitive inhibitor decreases the enzyme's activity.
  • A competitive inhibitor is reversible, while a noncompetitive inhibitor is irreversible.
  • A competitive inhibitor binds to the enzyme's active site, while a noncompetitive inhibitor binds to the enzyme outside of the active site. (correct)

    • What is the role of zymogens in enzyme regulation?

    <p>Zymogens are inactive forms of enzymes that can be converted to the active form when needed.</p> Signup and view all the answers

    How do enzymes function as diagnostic tools?

    <p>Enzymes are released from cells when they are damaged, and the presence of these enzymes in the body can be used to diagnose certain conditions.</p> Signup and view all the answers

    How do enzymes affect the speed of chemical reactions?

    <p>Enzymes increase the speed of chemical reactions by lowering the energy requirement.</p> Signup and view all the answers

    What is the main function of enzymes?

    <p>Increasing the rate of chemical reactions</p> Signup and view all the answers

    How do enzymes differ from ordinary reactions?

    <p>Enzymes do not undergo chemical changes during catalysis</p> Signup and view all the answers

    What suffix is commonly found at the end of enzyme names?

    <p>-ase</p> Signup and view all the answers

    Which theory describes enzymes as having high specificity?

    <p>Lock-and-key theory</p> Signup and view all the answers

    What happens to enzymes during catalysis?

    <p>They remain unchanged and can be reused</p> Signup and view all the answers

    Which model or theory provides a simple way of explaining the function of enzymes?

    <p>Lock-and-key theory</p> Signup and view all the answers

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