BIOMOLECULES: Amino Acids and Proteins
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Questions and Answers

How many different amino acids are known to occur naturally?

  • 8
  • 12
  • Over 700 (correct)
  • 20

    • What is the characteristic of Proline among the standard amino acids?

  • It is an essential amino acid that must be obtained from the diet
  • It has a cyclic side chain that incorporates the α-amino function (correct)
  • It has a side chain represented by R
  • It is not coded for in DNA-directed protein synthesis

    • How many of the standard amino acids are synthesized by the human body?

  • 8
  • 12 (correct)
  • 20
  • 15

    • What is the classification of amino acids based on?

    <p>The location of the amine group on the carbon chain</p> Signup and view all the answers

    What is the characteristic of Glycine among the standard amino acids?

    <p>It is Achiral</p> Signup and view all the answers

    What is the primary form of amino acids in strongly acidic solutions?

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

    At what pH do the concentrations of the anions and cations of an amino acid become equal?

    <p>At the isoelectric point</p> Signup and view all the answers

    What is the term for the form of an amino acid in which the carboxyl group is present as a carboxylate ion and the amino group is present as an aminium ion?

    <p>Zwitter ion</p> Signup and view all the answers

    How is the isoelectric point (pI) of an amino acid such as alanine calculated?

    <p>By taking the average of pKa1 and pKa2</p> Signup and view all the answers

    What is the term for the pH at which an amino acid has no net charge?

    <p>Isoelectric pH</p> Signup and view all the answers

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