Among the 20 standard proteins coding amino acids, which one is least occurs in proteins?

Among the 20 standard proteins coding amino acids, which one is least occurs in proteins?

Q. Among the 20 standard proteins coding amino acids, which one is least occurs in proteins?

A.            Glycine

B.            Alanine

C.            Tryptophan

D.            Methionine

Answer: Tryptophan

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