Master the Secrets of Hair and Nails
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Questions and Answers

Which of the following is a characteristic of tough fibers found in hair, nails, and the outer epidermal layer of mammals?

  • Their structural unit is a beta-sheet polypeptide
  • They lack cysteine residues
  • They are highly soluble in water
  • They contain alpha-helix-breaking amino acids (correct)

    • Which of the following amino acids is abundant in the α-helical polypeptide of tough fibers?

  • Alanine (correct)
  • Proline
  • Cysteine
  • Glycine

    • Why are tough fibers resistant to stretching under normal conditions?

  • They lack cysteine residues
  • They contain beta-sheet structures
  • They have high solubility in water
  • They form inter-helix disulfide bridges (correct)

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