Q21 / 180 · NEET 2013 (Karnataka) · Botany

The figure shows a hypothetical tetrapeptide portion with parts labelled a-d. Which is the correct option? Figure

  • A
    $c$ is an aromatic amino acid tryptophan.
  • B
    $a$ is the C-terminal amino acid and $d$ is $\mathrm{N}$-terminal amino acid.
  • C
    $a$ is a sulphur containing amino acid methionine.
  • Correct answer
    D
    $d$ is the acidic amino acid-glutamic acid.

Solution

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 $(-\mathrm{COOH})$ containing amino acid is (d). Residue (d) indicates glutamic acid, an acidic residue due to presence of $(-\mathrm{COOH})$ group. So, the correct answer is 'd is acidic amino acid - glutamic acid'.

Hence, the correct answer is option: 'D'.

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