Human immuno deficiency virus has:
(A) DNA genome
(B) RNA genome
(C) Reverse transcriptase
(D) DNA polymerase
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (B) and (C) only
The human immuno deficiency virus (HIV) is a retrovirus. Its genetic material is RNA. Inside a macrophage the RNA is copied into viral DNA by an enzyme that the virus brings, called reverse transcriptase. The viral DNA joins the host cell’s DNA and directs it to make new viruses.
(A) DNA genome — Incorrect. The genome of HIV is RNA, not DNA. DNA is made only later, inside the host cell.
(B) RNA genome — Correct. HIV carries RNA as its genetic material.
(C) Reverse transcriptase — Correct. This enzyme copies the viral RNA into DNA.
(D) DNA polymerase — Incorrect. NCERT names reverse transcriptase as the enzyme that makes the viral DNA. It names no DNA polymerase for the virus.
NCERT Extract:
AIDS – …
Figure 7.6 Replication of retrovirus