CUET · BIOLOGY · PYQ PAPER 2023

Arrange the following steps of replication of retrovirus in correct sequence
A. Incorporation of viral DNA into host genome.
B. Formation of viral DNA by reverse transcription.
C. Infection of normal cell by virus and introduction of viral RNA into host
D. Production of new viral RNA by infected cells.
Choose the correct answer from the options given below:

A D → C → A → B
B D → B → A → C
C C → B → A → D
D A → D → B → C

Verified Solution

Answer & Solution

Correct Answer

(C) C → B → A → D

Step-by-step Solution

Detailed explanation

C → B → A → D

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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