Regulation of Enzyme Activity
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Questions and Answers

Which model describes an enzyme having a pre-determined shape for the active site, where only substrates of specific shape can bind?

  • Sequential model
  • Lock-and-key model (correct)
  • Allosteric model
  • Induced fit model
  • What type of specificity involves an enzyme distinguishing between stereoisomers?

  • Substrate specificity
  • Group specificity
  • Stereochemical specificity (correct)
  • Linkage specificity
  • Which enzyme cleaves amino acids one at a time from the carboxyl end of a peptide chain?

  • Carboxypeptidase (correct)
  • Phosphatase
  • Oxidase
  • Isomerase
  • What is required for the formation of an enzyme-substrate complex?

    <p>Intermediate reaction species</p> Signup and view all the answers

    Which type of enzyme specificity involves hydrolyzing phosphate-ester bonds in all types of phosphate esters?

    <p>Linkage specificity</p> Signup and view all the answers

    What is the purpose of regulating enzyme activity within a cell?

    <p>To prevent wasting energy</p> Signup and view all the answers

    In reversible noncompetitive inhibition, where does the inhibitor bind?

    <p>A different site on the enzyme than the active site</p> Signup and view all the answers

    Why does increasing the concentration of substrate not completely overcome noncompetitive inhibition?

    <p>Because the inhibitor changes the enzyme's structure</p> Signup and view all the answers

    Which ions are examples of noncompetitive inhibitors mentioned in the text?

    <p>Lead, silver, and mercury ions</p> Signup and view all the answers

    What is one reason for turning off an enzyme within a cell?

    <p>To prevent energy wasting</p> Signup and view all the answers

    Which general mechanism is associated with feedback control in enzyme regulation?

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

    What is a zymogen?

    <p>A precursor to an active enzyme</p> Signup and view all the answers

    Which of the following statements about allosteric enzymes is true?

    <p>They have at least two binding sites</p> Signup and view all the answers

    What is the role of regulators in allosteric enzymes?

    <p>They cause changes in the overall three-dimensional structure of the enzyme</p> Signup and view all the answers

    What happens when a regulator binds to an allosteric enzyme?

    <p>The enzyme becomes less active</p> Signup and view all the answers

    What is a proteolytic enzyme?

    <p>An enzyme that catalyzes the breaking down of peptide bonds</p> Signup and view all the answers

    What is the function of pepsinogen?

    <p>It is a precursor to a digestive enzyme</p> Signup and view all the answers

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