A) neutral amino acid
B) polar amino acids
C) protein amino acids
D) rare amino acids
Correct Answer: D
Solution :
Non-coded amino acid Any \[\alpha -amino\] acid residue occurring in a polypeptide or protein for which no codon exists is called non-coded amino acid, e.g., carboxyglutamic acid, hydroxylysine, hydr- xyproline, oxyproline. Residues of these amino acids are formed from residues of the corresponding coded amino acids by post-translational modification of the polypeptide chain. They are also called rare amino acid.
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