Enzyme Kinetics Quiz
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Questions and Answers

Which enzyme has a lower Vmax compared to glucokinase?

  • Neither
  • Both
  • Not enough information provided
  • Hexokinase (correct)
  • Which enzyme has a lower Km compared to glucokinase?

  • Neither
  • Both
  • Hexokinase (correct)
  • Not enough information provided
  • Which enzyme is turned off by high concentrations of glucose-6-P?

  • Both
  • Neither
  • Glucokinase (correct)
  • Hexokinase
  • What same reaction do both hexokinase and glucokinase catalyze?

    <p>Convert glucose to G-6P (B)</p> Signup and view all the answers

    What is the product of the reaction catalyzed by hexokinase and glucokinase used for?

    <p>Glycogenesis (B)</p> Signup and view all the answers

    Which line in the graph represents glucokinase?

    <p>Red (A)</p> Signup and view all the answers

    Which intercept represents Vmax?

    <p>A (C)</p> Signup and view all the answers

    Which intercept represents 1/2 Vmax?

    <p>C (A)</p> Signup and view all the answers

    Which intercept represents Km?

    <p>D (C)</p> Signup and view all the answers

    What does the higher Km of glucokinase tell you about its affinity for glucose compared to hexokinase?

    <p>Glucokinase has lower affinity for glucose (D)</p> Signup and view all the answers

    Which type of enzyme inhibition occurs when an inhibitor forms a covalent bond with the active site of the enzyme?

    <p>Irreversible inhibition (B)</p> Signup and view all the answers

    What type of inhibition occurs when an inhibitor binds to the active site of the enzyme and competes with the substrate for binding?

    <p>Competitive inhibition (A)</p> Signup and view all the answers

    In competitive inhibition, does the affinity of the enzyme appear to go up or down in the presence of the inhibitor?

    <p>Affinity remains the same (C)</p> Signup and view all the answers

    What type of inhibition occurs when an inhibitor binds to the enzyme-substrate complex and prevents the release of the product?

    <p>Uncompetitive inhibition (B)</p> Signup and view all the answers

    In uncompetitive inhibition, is Vmax lower or higher in the presence of the inhibitor?

    <p>Vmax is lower (C)</p> Signup and view all the answers

    What type of inhibition occurs when an inhibitor binds to the enzyme or the enzyme-substrate complex at a site other than the active site?

    <p>Noncompetitive inhibition (D)</p> Signup and view all the answers

    In noncompetitive inhibition, is Vmax lower or higher in the presence of the inhibitor?

    <p>Vmax is lower (C)</p> Signup and view all the answers

    What happens when an activator binds to a multi-subunit allosteric enzyme?

    <p>The enzyme becomes more active (D)</p> Signup and view all the answers

    What effect does an inhibitor have on the substrate graph of a multi-subunit allosteric enzyme?

    <p>The graph shifts to the right (D)</p> Signup and view all the answers

    What does the term 'allosteric inhibition' tell us about where an inhibitor binds when it is acting as an inhibitor?

    <p>It binds to an allosteric site (A)</p> Signup and view all the answers

    Which of the following is NOT an objective of the Kinetics section?

    <p>Determine the Km and Vmax of an enzyme (C)</p> Signup and view all the answers

    What is the main purpose of a Lineweaver-Burk plot?

    <p>To determine the Km and Vmax of an enzyme (A)</p> Signup and view all the answers

    Which of the following reactions conforms to Michaelis-Menten kinetics?

    <p>Pseudo-first order reaction (B)</p> Signup and view all the answers

    What is the difference between glucokinase and hexokinase?

    <p>All of the above (D)</p> Signup and view all the answers

    What does Kcat represent?

    <p>The maximum rate of the enzyme-catalyzed reaction (C)</p> Signup and view all the answers

    Which of the following is an example of physiologically efficient enzyme?

    <p>All of the above (D)</p> Signup and view all the answers

    What is the difference between competitive, uncompetitive, and non-competitive inhibition?

    <p>Competitive inhibition occurs when the inhibitor binds to the active site, uncompetitive inhibition occurs when the inhibitor binds to the enzyme-substrate complex, and non-competitive inhibition occurs when the inhibitor binds to a site other than the active site (A)</p> Signup and view all the answers

    How does the graph of an allosteric enzyme change in the presence of an inhibitor?

    <p>The graph shifts to the right (D)</p> Signup and view all the answers

    What is happening in a first order reaction?

    <p>The rate of the reaction is directly proportional to the concentration of the reactant (C)</p> Signup and view all the answers

    What is happening in a zero-order reaction?

    <p>The rate of the reaction remains constant over time (C)</p> Signup and view all the answers

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