Enzyme Structure: Prosthetic Group and Isoenzymes
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Questions and Answers

Which type of specificity refers to an enzyme acting on only one substrate?

  • Regulation specificity
  • Bond specificity
  • Location specificity
  • Absolute specificity (correct)
  • Which type of specificity involves enzymes acting on specific bonds or linkages?

  • Location specificity
  • Regulation specificity
  • Absolute specificity
  • Bond specificity (correct)
  • Enzyme activity can be regulated to respond to cellular needs. Which characteristic does this exemplify?

  • Coenzyme function
  • Prosthetic group involvement
  • Rate-limiting step control (correct)
  • Isozyme activity
  • What term is used to describe the collective term for coenzymes and cofactors that are essential for enzyme function?

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

    Which term describes an enzyme with its required prosthetic group or coenzyme attached?

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

    Compartmentalization of enzymes within specific organelles serves which purpose?

    <p>Isolating reactions from competing reactions</p> Signup and view all the answers

    What term is used to describe the non-protein part that is tightly bound to the apoenzyme and is difficult to remove without damaging the enzyme?

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

    Which of the following best describes isozymes (isozymes)?

    <p>Enzymes with similar catalytic activity but different characteristics</p> Signup and view all the answers

    What sets the pace for the entire enzymatic reaction, as it is usually the slowest step?

    <p>Rate limiting step</p> Signup and view all the answers

    Which term refers to the fully active form of an enzyme consisting of both the protein part and its bound cofactor/prosthetic group?

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

    In an enzymatic reaction, what is a coenzyme?

    <p>An organic molecule that aids enzyme function by carrying chemical groups</p> Signup and view all the answers

    What primarily constitutes an apoenzyme?

    <p>The protein part of an enzyme without its cofactor/prosthetic group</p> Signup and view all the answers

    What is the main difference between holoenzymes and apoenzymes?

    <p>Holoenzymes have both protein and non-protein components, while apoenzymes are made up of only protein molecules.</p> Signup and view all the answers

    Which of the following is a characteristic of coenzymes in enzymes?

    <p>Coenzymes are organic molecules that facilitate enzyme function by carrying chemical groups between enzymes.</p> Signup and view all the answers

    What role do cofactors play in enzyme function?

    <p>Cofactors stabilize the conformation of enzymes but do not directly participate in catalysis.</p> Signup and view all the answers

    What is the significance of isozymes in metabolic reactions?

    <p>Isozymes increase the diversity of enzymes in cells, allowing for fine-tuning of metabolic processes.</p> Signup and view all the answers

    In enzymatic reactions, what is the function of a prosthetic group?

    <p>Prosthetic groups bind covalently to the apoenzyme and participate directly in catalysis.</p> Signup and view all the answers

    Which statement accurately describes the concept of rate-limiting steps in metabolic reactions?

    <p>Rate-limiting steps determine the overall rate of a metabolic pathway by being the slowest step in the sequence of reactions.</p> Signup and view all the answers

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