CUET · BIOLOGY · PYQ PAPER 2025

A nucleoside comprises:

A A nitrogenous base, a pentose sugar, and a phosphate group
B A nitrogenous base and a phosphate group
C A nitrogenous base and a pentose sugar
D A pentose sugar and a phosphate group

Verified Solution

Answer & Solution

Correct Answer

(C) A nitrogenous base and a pentose sugar

Step-by-step Solution

Detailed explanation

A nitrogenous base and a pentose sugar

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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