Enzymes in Biological Systems Quiz
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Questions and Answers

Why can't biological systems rely solely on raising temperatures to accelerate reactions?

  • Because low temperatures are more effective in accelerating reactions
  • Because enzymes become inactive at high temperatures
  • Because high temperatures make enzymes less specific
  • Because high temperatures disrupt cellular structures (correct)

    • Which statement best describes the active site of an enzyme?

  • It is a specific region of the enzyme where the substrate binds and undergoes catalysis. (correct)
  • It is the region of the enzyme responsible for its overall structure and stability.
  • It is the entire enzyme molecule that interacts with the substrate.
  • It is a random part of the enzyme that changes for each substrate.

    • Which model best explains the specificity and rate enhancement of enzyme-catalyzed reactions?

  • The transition state theory, which explains rate enhancement but not specificity.
  • The enzyme distortion model, which proposes that enzymes change shape randomly.
  • The lock-and-key model proposed by Emil Fischer.
  • The induced-fit model proposed by Daniel E.Koshland Jr. (correct)

    • How do enzymes achieve their specificity for particular substrates?

    <p>By having an active site that can only bind substrates with the correct functional groups and configurations.</p> Signup and view all the answers

    What is the role of the enzyme in lowering the activation energy of a reaction?

    <p>The enzyme distorts the substrate to a structure closer to the transition state, lowering the activation energy.</p> Signup and view all the answers

    What is the significance of the induced-fit model in explaining the rate enhancement of enzyme-catalyzed reactions?

    <p>The induced-fit model demonstrates how enzymes can alter the substrate's structure to facilitate the reaction.</p> Signup and view all the answers

    Which of the following statements about enzymes is incorrect?

    <p>Enzymes prevent chemical reactions from occurring in biological systems</p> Signup and view all the answers

    What is the primary mode of interaction between an enzyme and its substrate?

    <p>Non-covalent interactions like hydrogen bonding, ionic attractions, and dipole-dipole attractions</p> Signup and view all the answers

    How do enzymes achieve their high specificity for substrates?

    <p>Through the precise complementary shape and intermolecular forces between the enzyme and substrate</p> Signup and view all the answers

    What is the primary role of enzymes in biological systems?

    <p>To catalyze chemical reactions by lowering the activation energy barrier</p> Signup and view all the answers

    Which of the following statements about enzyme-catalyzed reactions is correct?

    <p>Enzymes catalyze reactions by lowering the activation energy required for the reaction to occur</p> Signup and view all the answers

    Which of the following statements about enzyme specificity is incorrect?

    <p>Enzyme specificity is a result of the formation of covalent bonds with substrates</p> Signup and view all the answers

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