A) Alanine
B) Valine
C) Proline
D) Histadine
E) Glycine
Correct Answer: E
Solution :
With the exception of glycine, all other a-amino acids have chiral carbon atom therefore glycine is achiral a-amino acid. \[\underset{glycine}{\mathop{N{{H}_{2}}-\underset{\begin{smallmatrix} | \\ H \end{smallmatrix}}{\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{C}}}\,-COOH}}\,\]
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