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(B) All naturally occurring amino acids found in proteins,except for glycine,are chiral.These amino acids exist in the $L$-configuration at their $\al

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have the $L$ configuration at their $\alpha$ carbon

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(B) All naturally occurring amino acids found in proteins,except for glycine,are chiral.These amino acids exist in the $L$-configuration at their $\alpha$-carbon atom.Glycine is the simplest amino acid,$NH_2-CH_2-COOH$,and is achiral because it lacks a chiral center.General structure of an $L$-amino acid: $NH_2-CH(R)-COOH$ where the amino group is on the left in the Fischer projection.

Peptide	$R_1$	$R_2$
$I$	$H$	$H$
$II$	$H$	$CH_3$
$III$	$CH_2COOH$	$H$
$IV$	$CH_2CONH_2$	$(CH_2)_4NH_2$
$V$	$CH_2CONH_2$	$CH_2CONH_2$
$VI$	$(CH_2)_4NH_2$	$(CH_2)_4NH_2$
$VII$	$CH_2COOH$	$CH_2CONH_2$
$VIII$	$CH_2OH$	$(CH_2)_4NH_2$
$IX$	$(CH_2)_4NH_2$	$CH_3$

Which statement correctly completes the statement?
Except for glycine,which is achiral,all the amino acids present in proteins ......

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Which statement correctly completes the statement?Except for glycine,which is achiral,all the amino acids present in proteins ......