(D) Keratin is the major structural fibrous protein that forms hair,wool,feathers,nails,and horns of many kinds of animals. It has a high concentratio

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(D) Keratin is the major structural fibrous protein that forms hair,wool,feathers,nails,and horns of many kinds of animals. It has a high concentration of cysteine,$7$ to $20 \%$ of the total amino acid residues,which form inter- and intramolecular disulfide bonds.