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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

Alpha-Keratins

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Questions and Answers

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

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

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

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