3 Questions
Which of the following is a characteristic of tough fibers found in hair, nails, and the outer epidermal layer of mammals?
They contain alpha-helix-breaking amino acids
Which of the following amino acids is abundant in the α-helical polypeptide of tough fibers?
Alanine
Why are tough fibers resistant to stretching under normal conditions?
They form inter-helix disulfide bridges
Test your knowledge on the tough fibers that form hair, nails, and the outer epidermal layer of mammals. Learn about their insolubility in water, structural unit, alpha-helix-promoting residues, lack of alpha-helix-breaking amino acids, and the role of cysteine residues in forming inter-helix disulfide bridges. Challenge yourself to understand why these fibers are resistant to stretch.
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