Enzymology Lesson 5: Importance of Enzymes and Regulation
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Questions and Answers

What is the role of the active site in an enzyme?

  • It is where the substrate molecule binds and undergoes catalytic transformation (correct)
  • It is where the enzyme's protein conformation is determined
  • It is where the enzyme is regulated by external agents
  • It is where water-soluble vitamins bind as coenzymes

    • What is a defining property of enzymes in terms of substrate specificity?

  • They can bind only one substrate (correct)
  • They can only bind water-soluble substrates
  • They have no specificity for any substrate
  • They can catalyze multiple different reactions

    • What is the function of the amino acid residues in the active site of an enzyme?

  • To bind the substrate and catalyze its chemical transformation (correct)
  • To bind the coenzymes during catalysis
  • To regulate the enzyme's catalytic activity
  • To provide structural support to the enzyme

    • What is the role of water-soluble vitamins in enzymatic reactions?

    <p>To bind to the active site as coenzymes</p> Signup and view all the answers

    How do enzymes increase the speed of a chemical reaction?

    <p>By creating tension between the substrate and catalytic residues</p> Signup and view all the answers

    What allows enzymes to have high specificity in their catalytic activity?

    <p>Their ability to bind only one specific substrate</p> Signup and view all the answers

    What is the function of enzymes in a chemical reaction?

    <p>Increasing reaction rates and lowering reaction activation barriers</p> Signup and view all the answers

    What is the maximum rate of a reaction when the enzyme is saturated with substrate?

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

    In enzymatic kinetics, what does V0 represent?

    <p>The rate of a reaction and how it changes with experimental parameters</p> Signup and view all the answers

    Which factor does NOT affect the reaction rate in enzymatic kinetics?

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

    What is the characteristic feature of a regulatory enzyme?

    <p>Undergoes change in catalytic activity by allosteric mechanisms or covalent modification</p> Signup and view all the answers

    What is the specific site on an allosteric protein molecule to which the modulator or effector molecule binds?

    <p>Allosteric site</p> Signup and view all the answers

    In reversible covalent modification, which process modulates the activity of the enzyme?

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

    What is the protein portion of an enzyme called?

    <p>[E] (enzyme concentration)</p> Signup and view all the answers

    What type of molecule is coenzyme Q?

    <p>[Cofactor]</p> Signup and view all the answers

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