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