Which of the following is correct regarding \(AIDS\) causative agent \(HIV\) ?

A \(HIV\) is enveloped virus containing one molecule of singlestranded \(RNA\) and one molecule of reverse transcriptase.
B \(HIV\) is enveloped virus that contains two identical molecules of singlestranded \(RNA\) and two molecules of reverse transcriptase.
C \(HIV\) does not escape but attacks the acquired immune response.
D Both \((b)\) and \((c)\)

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Answer & Solution

Correct Answer

(D) Both \((b)\) and \((c)\)

Step-by-step Solution

Detailed explanation

(d) : \(HIV\) is spherical virus with a diameter of about \(90-120\ nm\). Its genome consists of a single stranded \(RNA\) filament segmented into two identical filaments and associated with reverse transcriptase enzymes. The envelope consists of a lipid bilayer derived from host cell membrane and projecting knob like glycoprotein spikes. It contains two protein coats. \(HIV\) is a retrovirus that attacks helper \(T\) cells. Without an adequate supply of helper cells, the immune system cannot signal \(B\) cells to produce antibodies to kill infected cells, thus body becomes susceptible to infections. This immune deficiency is described by the name acquired immune deficiency syndrome or \(AIDS\).

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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