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Q.

 In  which of the following, Keratin, a fibrous protein is absent?

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a

Wool

b

Muscles

c

Hair

d

Silk

answer is B.

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Detailed Solution

S− Containign amino acids = Cysteine, methionine.
OH−Containing amino acid = Serine
NH2− Containing amino acid = Lysine.
 

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