Which of the following is correct regarding AIDS causative agent HIV?
Answer: (B) B. Answer: (B) HIV is enveloped virus that contains two identical molecules of single-stranded RNA and two molecules of reverse transcriptase Solution: HIV is a retrovirus with an envelope enclosing its RNA genome.
- A.A
- B.B✓
- C.C
- D.D
Correct Answer
(B) B
Solution & Explanation
Answer: (B) HIV is enveloped virus that contains two identical molecules of single-stranded RNA and two molecules of reverse transcriptase Solution: HIV is a retrovirus with an envelope enclosing its RNA genome. The retrovirus particle is diploid, carrying two identical single-stranded RNA molecules and two copies of the enzyme reverse transcriptase, which converts the viral RNA into DNA inside the host cell. Why not the others: A understates the genome (it is two RNA + two reverse transcriptase, not one each); C is wrong because HIV IS enveloped; D is false because HIV does escape immune detection and progressively destroys helper T-cells of the acquired immune response. NCERT Reference: NCERT Ch7, p.138-139, lines 38-40 (p.138): "AIDS is caused by the Human Immuno deficiency Virus (HIV), a member of a group of viruses called retrovirus, which have an envelope enclosing the RNA genome"