Biochemistry Lecture 9: Enzymes and Holoenzyme
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Questions and Answers

What term refers to the compound on which an enzyme acts?

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

  • Active site (correct)
  • Apoenzyme
  • Holoenzyme
  • Cofactor
  • What is the specific region where the substrate binds to an enzyme called?

  • Active site (correct)
  • Apoenzyme
  • Cofactor
  • Holoenzyme
  • What is the term for a complete, functional enzyme that is catalytically active and consists of an apoenzyme together with its cofactors?

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

    What do enzymes lower in order to speed up reactions?

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

    What is the name for the reactants that need to have a certain energy before they will react?

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

    What are cofactors that are small organic molecules called?

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

    Which family of enzymes assists in the breakdown of carbohydrates?

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

    What type of specificity refers to the enzyme acting on a particular type of chemical bond regardless of the rest of the molecular structure?

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

    Which model of enzyme binding states that the active site is rigid in shape and does not change at all?

    <p>The lock-and-key model</p> Signup and view all the answers

    What are examples of metal ions that act as cofactors?

    <p>$Co, Cu, and Zn$</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 term is used for cofactors that are tightly bound to enzymes?

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

    What is the most common type of cofactor?

    <p>$B$ vitamins</p> Signup and view all the answers

    Which enzyme works at a very acidic pH of 1.5?

    <p>$\alpha$-amylase</p> Signup and view all the answers

    What does the induced-fit model state about the enzyme's shape?

    <p>The enzyme changes its shape for substrate binding.</p> Signup and view all the answers

    What is the compound on which an enzyme acts called?

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

    What type of specificity refers to the enzyme acting on a particular type of chemical bond regardless of the rest of the molecular structure?

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

    What model of enzyme binding states that the active site is rigid in shape and does not change at all?

    <p>Lock and key model</p> Signup and view all the answers

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

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

    What enzyme works at a very acidic pH of 1.5?

    <p>Pepsin</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 type of specificity refers to the enzyme acting on a particular steric or optical isomer?

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

    Which model of enzyme binding states that the active site changes its shape to fit the substrate only after the substrate has been bound?

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

    What term refers to the compound on which an enzyme acts?

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

    What is the specific region where the substrate binds to an enzyme called?

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

    Which enzyme works at a very acidic pH of 1.5?

    <p>Pepsin</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

    What do enzymes lower in order to speed up reactions?

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

    What are examples of metal ions that act as cofactors?

    <p>Cu and Zn</p> Signup and view all the answers

    Which type of enzymatic action involves breaking a single structure into smaller components or joining two or more substrate molecules together?

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

    What is the most common type of cofactor?

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

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