Biochemistry: AIIMS PG Q-1

Q-1. Which of these amino acids does not have anomeric carbon atom?

a) Valine
b) Alanine
c) Tyrosine
d) Glycine

Answer: Glycine
With the sole exception of glycine, the alfa-carbon of amino acids is chiral. Glycine lacks anomeric carbon.
Although some protein amino acids are dextrorotatory and some levorotatory, all share the absolute configuration of L-glyceraldehyde and thus are L-alpha-amino acids.