Enzymes
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Questions and Answers

What is the function of enzymes?

  • They change their structure during chemical reactions
  • They slow down chemical reactions to conserve energy
  • They speed up chemical reactions without being changed themselves (correct)
  • They only work on a single type of substrate

    • What is a characteristic of enzymes' structure?

  • They lack a defined mechanism
  • They have a defined amino acid sequence (correct)
  • They have a constantly changing three-dimensional structure
  • They are typically 1000-5000 amino acids long

    • How much faster can enzymes typically increase the speed of a reaction?

  • Equal speed as the uncatalyzed reaction
  • Depends on the size of the enzyme
  • 106-10^14 times faster (correct)
  • 2-5 times faster

    • What does it mean for enzymes to be stereospecific?

    <p>The reaction produces a single product</p> Signup and view all the answers

    Are enzymes reusable?

    <p>Yes, once an enzyme binds to a substrate and catalyzes the reaction, it is released unchanged</p> Signup and view all the answers

    What is an enzyme a substance that speeds up a chemical reaction and is changed by the reaction?

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

    Enzymes have a defined threedimensional structure.

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

    Enzymes increase the speed of a reaction typically by 10^6-10^14 times faster than the rate of the uncatalyzed reaction.

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

    Enzymes are always specific to a single substrate.

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

    Once an enzyme binds to a substrate and catalyzes the reaction, the enzyme is changed and cannot be used for another reaction.

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

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