A) valine, lysine and cysteine
B) tryptophan, glutamic acid and aspartic acid
C) citrulline, methionine and giumeric acid
D) cysreine, cystine and methionine
Correct Answer: D
Solution :
Amino acids are amphoteric in nature (ie, both acidic and alkyl group present). Sulphur containing amino acids are cysteine, methionine and cysteine (cystine is a non-protein amino acid).
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