Among the 20 standard proteins which coding amino acids, which of the following occurs the least number of times in proteins?

Among the 20 standard proteins which coding amino acids, which of the following occurs the least number of times in proteins?

Q. Among the 20 standard proteins which coding amino acids, which of the following occurs the least number of times in proteins?

A.            Glycine

B.            Alanine

C.            Tryptophan

D.            Methionine

Answer: Tryptophan

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