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Alpha-Keratins
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Alpha-Keratins

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Questions and Answers

Which of the following is NOT a characteristic of α-keratins?

  • They lack alpha-helix-breaking amino acids
  • Their structural unit is a α-helical polypeptide
  • They are found in the outer epidermal layer of mammals (correct)
  • They are very insoluble in water

    • Which amino acids are abundant in α-keratins and promote the formation of alpha-helices?

  • Methionine and phenylalanine
  • Alanine and glycine (correct)
  • Leucine and valine
  • Proline and cysteine

    • What makes α-keratins resistant to stretching under normal conditions?

  • Their abundance in hair and nails
  • Their inter-helix disulfide bridges (correct)
  • Their insolubility in water
  • The presence of proline amino acids

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