Question

Except for glycine, which is achiral, all the amino acids present in proteins

• A. Are chiral, but racemic
• B. Have the L configuration at their $\alpha $ carbon
• C. Have the R configuration at their $\alpha $ carbon
• D. Have the S configuration at their $\alpha $ carbon

Answer 1

Answer: (B)

Amino acids which combine into peptide chains to form the building blocks of a rest array of proteins are all L-stereoisomers (left handed)
Glycine $NH_{2}-CH_{2}-COOH$
L-amino acid