A) DNA is not present at any stage in the life cycle of retroviruses
B) Retroviruses carry gene for RNA dependent DNA polymerase
C) The genetic material in mature retroviruses is RNA
D) Retroviruses are causative agents for certain kinds of cancer in man
Correct Answer: A
Solution :
Retroviruses are so named because they contain enzyme reverse transcriptase or RNA dependent DNA polymerase. The genetic material of these viruses is RNA. eg, Rous sarcoma virus.
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