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Identify the correct statement among the following:

1. All naturally occurring amino acids except glycine contain one chiral centre.
2. Glutamic acid is the only amino acid that contains a –COOH group at the side chain.
3. Amino acid, cysteine can easily undergo dimerisation due to the presence of free SH group.
4. All naturally occurring amino acids are optically active.

Correct answer: Amino acid, cysteine can easily undergo dimerisation due to the presence of free SH group.

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