Enzyme Catalysis in Biochemical Reactions
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Questions and Answers

What is the role of enzymes in biochemical reactions?

  • Have no impact on activation energy
  • Transform products into substrates
  • Increase the activation energy
  • Decrease the activation energy (correct)
  • What is the function of the catalytic site in an enzyme's structure?

  • Bind the product molecule
  • Increase the activation energy
  • Have no specific function
  • Bind the reactant molecule (correct)
  • What is the purpose of a cofactor in enzyme catalysis?

  • Increase enzyme concentration
  • Bind with the substrate molecule
  • Provide structural support to enzymes
  • Enhance enzyme activity (correct)
  • What is the role of the enzyme-substrate complex in an enzymatic reaction?

    <p>Facilitate reaction by stabilizing transition state</p> Signup and view all the answers

    How does enzyme concentration compare to total substrate concentration in catalysis?

    <p>Enzyme concentration is greater</p> Signup and view all the answers

    What does the Michaelis constant (Km) represent in enzyme kinetics?

    <p>Enzyme-substrate binding affinity</p> Signup and view all the answers

    What is the purpose of a catalyst in a chemical reaction?

    <p>To decrease the activation energy of the reaction</p> Signup and view all the answers

    What characterizes inhibitors in the context of catalysis?

    <p>They decrease the activation energy</p> Signup and view all the answers

    How do positive catalysts influence the number of effective collisions between reactants?

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

    What is the main effect of a catalyst on a chemical reaction?

    <p>Decreasing the time needed for the reaction to proceed</p> Signup and view all the answers

    In enzyme catalysis, what is the function of an enzyme-substrate complex?

    <p>Catalyze formation of products</p> Signup and view all the answers

    Why do catalysts not change the yield of a reaction?

    <p>They provide an alternative pathway with lower activation energy</p> Signup and view all the answers

    What term describes the step by step pathway by which a reaction occurs?

    <p>Reaction mechanism</p> Signup and view all the answers

    Which term refers to the number of species that must collide to produce the reaction indicated by an elementary step?

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

    In enzyme catalysis, what term describes the species that appear in the mechanism of the reaction but not in the overall balanced equation?

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

    What is the term for a series of simple reactions that represent the progress of an overall reaction at the molecular level?

    <p>Elementary steps</p> Signup and view all the answers

    In most mechanisms, which step is typically slower than the others?

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

    What controls the overall rate of a reaction in terms of its kinetics?

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

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