Protein Modifications and Structures Quiz
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Questions and Answers

What does the term 'apoenzyme' refer to?

  • An enzyme with only one type of coenzyme
  • An enzyme without any classification number
  • An enzyme without its cofactor or coenzyme (correct)
  • An enzyme with its cofactor or coenzyme

    • In the context of enzyme kinetics, what does a higher Km value indicate?

  • Lower affinity between the enzyme and substrate (correct)
  • A fully occupied active site
  • Maximum velocity the enzyme can reach
  • Higher affinity between the enzyme and substrate

    • How would you describe Reversible Non-competitive Inhibition in terms of enzyme-substrate interaction?

  • The substrate concentration increases Km value
  • The enzyme binds tightly to the substrate
  • The inhibitor binds to a site outside the active site of the enzyme (correct)
  • The inhibitor competes with the substrate for the active site

    • What is the role of a biocatalyst in a chemical reaction?

    <p>Speeds up the reaction by lowering the activation energy</p> Signup and view all the answers

    Which of the following statements is true about enzymatic cofactors?

    <p>They act as keys that unlock the enzyme-substrate complex</p> Signup and view all the answers

    How do enzymes differ from ribozymes in terms of their classification as biocatalysts?

    <p>Enzymes are always proteins, while ribozymes can be RNA molecules</p> Signup and view all the answers

    What determines whether an amino acid is in L- or D- configuration?

    <p>The position of the amino group (-NH2) relative to the carboxyl group (-COOH) on the carbon chain</p> Signup and view all the answers

    What characterizes a Zwitterion?

    <p>Consists of nonadjacent regions of charges</p> Signup and view all the answers

    What is the significance of reaching the isoelectric point (pI) for an amino acid?

    <p>It results in a net charge of zero for the entire molecule</p> Signup and view all the answers

    Which structural feature is essential for an amino acid to be considered a Zwitterion?

    <p>Having at least one positive and one negative functional group</p> Signup and view all the answers

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