Identify the correct statement among the following:
Biomolecules · Class 12 · JEE Main Previous Year Question
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 group at the side chain.
- d✓
Amino acid, cysteine easily undergo dimerisation due to the presence of free SH group.
Amino acid, cysteine easily undergo dimerisation due to the presence of free SH group.
Step 1: Evaluating Amino Acids — All naturally occurring amino acids are optically active except glycine, which lacks a chiral center. Cysteine has a side chain with a thiol group ().
Step 2: Identifying the Correct Fact — Cysteine molecules can easily undergo oxidation of their thiol groups to form a disulfide bond, resulting in the dimer 'cystine'.
Step 3: Conclusion — This specific property of cysteine is vital for maintaining the tertiary structure of proteins. Statement (d) is the correct one.
Key Point: Disulfide bridges provide significant stabilization to the folded shape of many proteins.
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