Non-Competitive Inhibitors and Enzyme Binding
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Questions and Answers

What role does a metal ion activator serve in enzyme catalysis?

  • Serve as a bridge to hold the substrate and enzyme together
  • Enhance enzyme specificity towards a variety of substrates
  • Function as a stabilizing agent in the conformation for catalytic activity (correct)
  • Act as the primary catalytic center

    • What is the general nature of enzymes?

  • Nucleic acids
  • Lipids
  • Proteins (correct)
  • Carbohydrates

    • How do enzymes enhance the rate of chemical reactions?

  • By directly participating in the chemical reaction
  • By lowering the activation energy required for the reaction to occur (correct)
  • By increasing the temperature of the reaction mixture
  • By changing the pH of the reaction environment

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

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

    What is the main function of oxidoreductase enzymes?

    <p>Facilitating electron transfer reactions</p> Signup and view all the answers

    How do enzymes catalyze physiologic reactions?

    <p>By lowering the activation energy level</p> Signup and view all the answers

    What is the purpose of ensuring that the substrate concentration is in excess in enzyme reactions?

    <p>To prevent the reaction from stopping prematurely</p> Signup and view all the answers

    Which of the following is NOT considered a cofactor for enzymes?

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

    What is the function of coenzymes in enzyme reactions?

    <p>Stabilize the enzyme-substrate complex</p> Signup and view all the answers

    What is the role of prosthetic groups in enzyme function?

    <p>Serve as permanent coenzymes for enzymes</p> Signup and view all the answers

    In reversible reactions, what characterizes a competitive inhibitor?

    <p>It competes with the substrate for the active site of the enzyme</p> Signup and view all the answers

    What defines absolute specificity in enzymes?

    <p>Matching with only one substrate and catalyzing one specific reaction</p> Signup and view all the answers

    What is the defining characteristic of non-competitive inhibitors in enzyme kinetics?

    <p>They do not resemble the substrate and bind to the enzyme in areas other than the active site</p> Signup and view all the answers

    How do irreversible inhibitors differ from reversible inhibitors in terms of enzyme inactivation?

    <p>Irreversible inhibitors destroy part of the enzyme involved in catalytic activity</p> Signup and view all the answers

    What effect does a non-competitive inhibitor have on enzyme activity?

    <p>Slows down the rate of the reaction without inactivating the enzyme</p> Signup and view all the answers

    Why does increasing substrate levels have no influence on the binding of a non-competitive inhibitor?

    <p>Because Km remains unchanged as substrates increase</p> Signup and view all the answers

    In irreversible inhibition, how does an inhibitor act as a 'suicide inhibitor'?

    <p>By forming covalent bonds with enzymes at the active site</p> Signup and view all the answers

    How do uncompetitive inhibitors influence enzyme activity?

    <p>By binding to the enzyme-substrate complex</p> Signup and view all the answers

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