Biochemistry Lecture 9: Enzymes
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Questions and Answers

What is the role of enzymes in biological reactions?

  • They participate in the reaction
  • They increase the activation energy
  • They act as substrates
  • They decrease the activation energy (correct)
  • Which part of the enzyme is responsible for binding to the substrate?

  • Active site (correct)
  • Cofactor
  • Apoenzyme
  • Holoenzyme
  • What is a holoenzyme?

  • An active enzyme without its apoenzyme
  • A complete, functional enzyme with its cofactors (correct)
  • An enzyme with a non-specific active site
  • An inactive enzyme lacking its cofactors
  • What happens when a substrate binds to an enzyme’s active site?

    <p>An enzyme-substrate complex is formed</p> Signup and view all the answers

    What do enzymes do to the energy barrier required for a reaction to occur?

    <p>Lower the energy barrier</p> Signup and view all the answers

    How do enzymes achieve faster reaction rates in biological reactions?

    <p>By decreasing the energy barrier</p> Signup and view all the answers

    What are the two groups into which cofactors can be subdivided?

    <p>Metals and small organic molecules</p> Signup and view all the answers

    Which type of enzymatic action involves joining two or more substrate molecules together?

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

    What are the most common cofactors called if they are also metal ions?

    <p>Metal ions</p> Signup and view all the answers

    Which family of enzymes is responsible for assisting in the breakdown of carbohydrates?

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

    What type of specificity involves the enzyme acting on a particular steric or optical isomer?

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

    In the lock-and-key model of enzyme binding, how does the active site change during substrate binding?

    <p>The active site remains rigid and does not change at all</p> Signup and view all the answers

    Which model of enzyme binding proposes that the enzyme changes its shape for substrate binding, forming a shape complementary to the substrate only after it has been bound?

    <p>Induced-fit model</p> Signup and view all the answers

    What is the term for cofactors that are tightly bound to enzymes?

    <p>Prosthetic groups</p> Signup and view all the answers

    Which group specificity involves the enzyme acting only on molecules with specific functional groups such as amino, phosphate, and methyl groups?

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

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