Enzyme Substrate Binding Theories Quiz
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Questions and Answers

Which type of reversible inhibitor has a molecular structure similar to the normal substrate of the enzyme?

  • Noncompetitive inhibitor
  • Allosteric inhibitor
  • Competitive inhibitor (correct)
  • Feedback inhibitor
  • What type of inhibitor binds to the active site of an enzyme and competes with substrate molecules?

  • Coenzyme inhibitor
  • Competitive inhibitor (correct)
  • Noncompetitive inhibitor
  • Allosteric inhibitor
  • In the induced-fit model, what changes when the substrate binds to the enzyme?

  • The substrate structure changes
  • The enzyme-substrate bond breaks
  • The active site is blocked
  • The enzyme structure changes (correct)
  • Which theory describes the perfect fit between the enzyme's active site and the substrate?

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

    What is the name for enzymes that catalyze the same reaction but differ in physical and chemical properties?

    <p>Isoenzymes</p> Signup and view all the answers

    Which equation describes the rate of enzymatic reactions as a function of substrate concentration?

    <p>Michaelis-Menten equation</p> Signup and view all the answers

    What model suggests that the active site of an enzyme forms a complementary shape to the substrate after the substrate has been bound?

    <p>Induced-fit model</p> Signup and view all the answers

    Which theory explains that the active site changes shape as it interacts with the substrate?

    <p>Induced-fit model</p> Signup and view all the answers

    In the lock and key theory, what does the active site of the enzyme resemble in terms of fitting with the substrate?

    <p>A lock and key</p> Signup and view all the answers

    In the Michaelis-Menten equation, what does Km represent?

    <p>Michaelis constant</p> Signup and view all the answers

    What happens when [S] is much less than Km in terms of the velocity of the reaction?

    <p>The velocity is proportional to the substrate concentration</p> Signup and view all the answers

    Which theory suggests that once the substrate is fully locked into position, catalysis can begin?

    <p>Induced-fit model</p> Signup and view all the answers

    What does the Vmax in the Michaelis-Menten equation signify?

    <p>Initial reaction velocity</p> Signup and view all the answers

    What is the main limitation of the lock and key theory in explaining enzyme-substrate binding?

    <p>Rigidity of the active site related to the substrate</p> Signup and view all the answers

    How does the induced-fit model differ from the lock and key theory in terms of enzyme-substrate binding?

    <p>Active site changes shape to match substrate vs. static fit in lock and key</p> Signup and view all the answers

    Which complex is formed when an enzyme reversibly combines with its substrate according to Michaelis and Menten?

    <p>ES complex</p> Signup and view all the answers

    What conclusion can be drawn about the relationship between enzyme concentration and reaction rate in Michaelis-Menten kinetics?

    <p>The rate is directly proportional to enzyme concentration</p> Signup and view all the answers

    What aspect of the enzyme changes upon substrate binding in the induced-fit model?

    <p>Shape of the active site</p> Signup and view all the answers

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