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Which of the following statements is not true for retroviruses?

1. DNA is not present at any stage in the life cycle of retroviruses
2. Retroviruses carry gene for RNA-dependent DNA polymerase
3. The genetic material in mature retroviruses is RNA
4. Retroviruses are causative agents for certain kinds of cancer in man

Correct answer: DNA is not present at any stage in the life cycle of retroviruses

Solution

Retroviruses use reverse transcriptase to convert their RNA genome into DNA, so DNA does appear during their life cycle. The other statements are true: they carry RNA-dependent DNA polymerase, have RNA as the genome in mature virions, and some cause cancers in humans.

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