NEET · Biology · STD 11 - 9. Biomolecules

The figure shows a hypothetical tetrapeptide portion of a protein with parts labelled \(A\) to \(D\). Which one of the following options is correct ?

A \(D\) is the acidic amino acid glutamic acid.
B \(C\) is an aromatic amino acid tryptophan.
C \(A\) is the C terminal amino acid and \(D\) is N terminal amino acid.
D None of these

Verified Solution

Answer & Solution

Correct Answer

(D) None of these

Step-by-step Solution

Detailed explanation

None of the options is correct.
\(A\) - Serine (Neutral Polar)
\(B\) - Cysteine (Neutral Polar)
\(C\) - Tyrosine (Neutral Polar)
\(D\) - Not an amino acid

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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