Enzyme Inhibition and Substrate Concentration Quiz

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Questions and Answers

What happens to the enzyme when an inhibitor is bound?

  • The enzyme is activated
  • The enzyme remains unchanged
  • The enzyme is inactivated (correct)
  • The enzyme degrades

Does the presence of substrate affect the inactivation of the enzyme by an inhibitor?

  • Yes, it enhances inactivation
  • Yes, it prevents inactivation
  • No, it has no impact on inactivation (correct)
  • No, it accelerates inactivation

How does the binding of an inhibitor affect the enzyme's activity?

  • Decreases enzyme activity (correct)
  • Activates the enzyme
  • Has no effect on enzyme activity
  • Increases enzyme activity

In the presence of an inhibitor, what happens to the enzyme-substrate complex?

<p>It dissociates more slowly (C)</p> Signup and view all the answers

What effect does the binding of an inhibitor have on substrate binding to the enzyme?

<p>Slows down substrate binding (C)</p> Signup and view all the answers

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Study Notes

Enzyme Inhibition

  • Competitive inhibition prevents the substrate from binding to the enzyme's active site.
  • High substrate concentrations can overcome competitive inhibition by replacing the inhibitor from the enzyme's active site.

Irreversible Inhibitors

  • Irreversible inhibitors are molecules that permanently inactivate an enzyme.
  • Kinetics of irreversible inhibitors:
    • Vmax (maximum reaction rate) decreases.
    • Km (Michaelis constant) remains unaffected.

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