All amino acids except lysine are optically active
B
All amino acids are optically active
C
All amino acids except glycine are optically active
D
All amino acids except glutamic acids are optically active
AIEEE 2012, Medium
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C
All amino acids except glycine are optically active
c With the exception of giycine all the $19$ other common amino acids have a uniferent functional group on the centralt terranedral alpha carbon.
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A tetrapeptide has $- COOH$ group on alanine. This produces glycine $(Gly)$, valine $(Val)$, phenyl alanine $(Phe)$ and alanine $(Ala)$, on complete hydrolysis. For this tetrapeptide, the number of possible sequences (primary structures) with $- NH _2$ group attached to a chiral center is: