NEET2013BotanyBiomolecules (B)Actual
The figure shows a hypothetical tetrapeptide portion with parts labelled a-d. Which is the correct option?
Options
- Ac is an aromatic amino acid tryptophan.
- Ba is the C-terminal amino acid and d is N -terminal amino acid.
- Ca is a sulphur containing amino acid methionine.
- Dd is the acidic amino acid-glutamic acid.
Correct answer
D. d is the acidic amino acid-glutamic acid.
Step-by-step 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 (- 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'.