Enzyme Lecture 12: ENZYMES
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Questions and Answers

What is the main reason an active site is compatible with its substrate?

  • It is composed of amino acids
  • It has a shape compatible with the substrate (correct)
  • The active site participates in making and breaking bonds
  • The catalytic groups donate or accept electrons
  • Which residues are directly involved in the making and breaking of bonds within the substrate?

  • Positive modulators
  • Catalytic groups (correct)
  • Allosteric groups
  • Negative modulators
  • What happens to the catalytic groups after the catalysis is complete?

  • They go back to their original state (correct)
  • They transform into allosteric groups
  • They disintegrate
  • They remain changed
  • In allosteric modulation, what effect does a positive modulator have on enzyme activity?

    <p>Increases activity</p> Signup and view all the answers

    What type of enzyme has the same active site and allosteric site?

    <p>Homotropic enzyme</p> Signup and view all the answers

    In feedback inhibition, which component inhibits the regulatory enzyme?

    <p>End product of the pathway</p> Signup and view all the answers

    What is the main function of an enzyme?

    <p>Catalyze the conversion of substrates into products</p> Signup and view all the answers

    Which of the following is a characteristic of enzymes?

    <p>Changes the state of the molecule</p> Signup and view all the answers

    What does it mean when it is said that enzymes are stereospecific?

    <p>They convert only a specific form of a compound</p> Signup and view all the answers

    What type of regulation involves the inhibition of an enzyme by the end product of a reaction?

    <p>Heterotropic allosteric regulation</p> Signup and view all the answers

    Which part of the enzyme is responsible for substrate binding and catalysis?

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

    In enzyme activity, which mechanism involves the addition of groups like phosphoryl and adenylyl to specific amino acids of proteins to make the enzyme more active?

    <p>Covalent modification</p> Signup and view all the answers

    What is the term for an inactive enzyme precursor that is activated through proteolytic cleavage by a separate enzyme?

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

    What is the function of a cofactor in enzyme activity?

    <p>Assists the enzyme in its function</p> Signup and view all the answers

    Why is it important for enzymes to be highly specific in substrate recognition?

    <p>To prevent side reactions</p> Signup and view all the answers

    Which part of an enzyme is responsible for interacting with the substrate to catalyze a reaction?

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

    What is the term for the process where some enzymes are produced as inactive precursors and activated through cleavage by proteolytic enzymes to regulate their activity?

    <p>Proteolytic cleavage</p> Signup and view all the answers

    What type of regulation involves altering enzyme activity through the binding of molecules at a site other than the active site?

    <p>Heterotropic allosteric regulation</p> Signup and view all the answers

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