Enzymes: Catalysts in Biological Reactions
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Questions and Answers

What does an enzyme- substrate complex form when a substrate binds to an enzyme's active site?

  • Cofactors
  • Holoenzyme
  • Apoenzyme
  • Reactants (correct)
  • What is the compound on which an enzyme acts?

  • Substrate (correct)
  • Catalyst
  • Holoenzyme
  • Apoenzyme
  • Where does catalysis occur in an enzyme?

  • Apoenzyme
  • Holoenzyme
  • Cofactors
  • Active site (correct)
  • What is the energy barrier that substrates need to overcome before a reaction occurs?

    <p>Activation energy</p> Signup and view all the answers

    What do enzymes lower in order to allow substrates to react faster?

    <p>Activation energy</p> Signup and view all the answers

    Which of the following is true about cofactors?

    <p>They can be both metals and small organic molecules.</p> Signup and view all the answers

    What is the function of prosthetic groups?

    <p>Bind transiently to the enzyme or substrate.</p> Signup and view all the answers

    Which of the following is an example of a metal cofactor?

    <p>Manganese (Mn)</p> Signup and view all the answers

    What is the main difference between absolute specificity and group specificity?

    <p>Absolute specificity only acts on one reaction, while group specificity acts on specific functional groups.</p> Signup and view all the answers

    According to the lock-and-key model of enzyme binding, what is the nature of the active site?

    <p>It is rigid in shape and complementary to the substrate.</p> Signup and view all the answers

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