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Amino Acids and Proteins in Cellular Biology
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Amino Acids and Proteins in Cellular Biology

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Questions and Answers

What is the typical number of different proteins found in a cell?

  • 15000
  • 9000 (correct)
  • 5000
  • 12000
  • What is the main function of enzymes, which are a type of protein?

  • Store nutrients
  • Provide structural support
  • Catalyze reactions in living systems (correct)
  • Transport oxygen
  • What is the distinguishing feature of the amino acid proline?

  • It has no amino group
  • It has a secondary amino group (correct)
  • It has a tertiary amino group
  • It has a primary amino group
  • What is the term for the form of amino acids that has both a positive and negative charge?

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

    What is the characteristic of all protein-derived amino acids except glycine?

    <p>They have at least one stereocenter</p> Signup and view all the answers

    What is the general term for the side chains of non-polar amino acids?

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

    What is the term for the pH at which the majority of molecules of an amino acid have no net charge?

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

    Which amino acid is a key precursor to neurotransmitters such as serotonin and catecholamines?

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

    What is the term for the modification of amino acids by certain organisms after biosynthesis?

    <p>Post-translational modification</p> Signup and view all the answers

    What is the type of bond that forms between the a-carboxyl group of one amino acid and the a-amino group of another amino acid?

    <p>Peptide bond</p> Signup and view all the answers

    Which of the following amino acids has a sulfhydryl group (-SH)?

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

    What is the term for a molecule composed of 2 amino acids joined by a peptide bond?

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

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