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Chemistry LibreTexts

26.E: Biomolecules: Amino Acids, Peptides, and Proteins (Exercises)

  • Page ID
    61709
  • These are the homework exercises to accompany the Textmap for McMurry's Organic Chemistry textbook.

    26.1 Structures of Amino Acids

    26.1 Exercises

    Questions

    Q26.1.1

    Why is cysteine the only L amino acid with an R configuration at the alpha carbon?

    Q26.1.2

    Isoleucine has two stereogenic centers.

    (a) Draw a Fischer projection of isoleucine.

    (b) Draw a Fischer projection of an isoleucine diastereomer, and label each stereocenter as R or S.

    Solutions

    S26.1.1

    The sulfur atom in the side chain causes the side chain to have higher priority than the other substituents.

    S26.1.2

    (a)

    (b)

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