Identify the correct statement among the following $:$

  • A
    All naturally occurring amino acids except glycine contain one chiral centre.
  • B
    All naturally occurring amino acids are optically active.
  • C
    Glutamic acid is the only amino acid that contains a $-COOH$ group at the side chain.
  • D
    Amino acid,cysteine easily undergoes dimerization due to the presence of a free $-SH$ group.

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