(C) Except for glycine,all other naturally occurring amino acids contain a chiral center at the $\alpha$-carbon atom.Glycine has the structure $H_2N-C

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All amino acids except glycine are optically active

(C) Except for glycine,all other naturally occurring amino acids contain a chiral center at the $\alpha$-carbon atom.Glycine has the structure $H_2N-CH_2-COOH$,where the $\alpha$-carbon is bonded to two identical hydrogen atoms,making it achiral.Therefore,all amino acids except glycine are optically active.

Class 12 Chemistry Biomolecules Amino Acids and Proteins

Medium

Which one of the following statements is correct?

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A
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 acid are optically active

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The substituents $R_1$ and $R_2$ for nine peptides are listed in the table given below. How many of these peptides are positively charged at $pH = 7.0$?
Peptide $R_1$ $R_2$
$I$ $H$ $H$
$II$ $H$ $CH_3$
$III$ $CH_2COOH$ $H$
$IV$ $CH_2CONH_2$ $(CH_2)_4NH_2$
$V$ $CH_2CONH_2$ $CH_2CONH_2$
$VI$ $(CH_2)_4NH_2$ $(CH_2)_4NH_2$
$VII$ $CH_2COOH$ $CH_2CONH_2$
$VIII$ $CH_2OH$ $(CH_2)_4NH_2$
$IX$ $(CH_2)_4NH_2$ $CH_3$

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