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The figure shows a hypothetical tetrapeptide portion of a protein with parts labeled A-D. Which one of the following option is correct?

1. A is the sulphur containing amino acid - methionine
2. B is the acidic amino acid - glutamic acid
3. C is an aromatic amino acid - tryptophan
4. A is the C-terminal amino acid and D is N-terminal amino acid

Correct answer: A is the C-terminal amino acid and D is N-terminal amino acid

Solution

In a peptide, the N-terminus is the residue with the free amino group, and the C-terminus is the residue with the free carboxyl group. The figure indicates D at the N-terminal end and A at the C-terminal end, so that statement is correct.

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