In the given figure a tetrapeptide is shown. Here, amino acids are indicated as (a), (b) (c) and (d). (a) indicates N-terminal amino acid and (d) indicates Cterminal residue. As it can be seen from the figure sulphur containing amino acid is b and carboxyl group (−COOH) containing amino acid is (d). Residue (d) indicates glutamic acid, an acidic residue due to presence of (−COOH) group. So, the correct answer is 'd is acidic amino acid - glutamic acid'.
NEET UG 2013 — Botany Biomolecules
2013mcqhard
The figure shows a hypothetical tetrapeptide portion with parts labelled a-d. Which is the correct option? 
Official previous-year question
Held on 30 Apr 2013 · Verified 9 Jul 2026.
Options
- A
c is an aromatic amino acid tryptophan.
- B
a is the C-terminal amino acid and d is N-terminal amino acid.
- C
a is a sulphur containing amino acid methionine.
- D
d is the acidic amino acid-glutamic acid.
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