Which of the following statement is not true for retroviruses?

DNA is not present at any stage in the life cycle of retroviruses.

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Retroviruses carry gene for RNA-dependent DNA polymerase.

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The genetic material in mature retroviruses is RNA.

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Retroviruses are causative agents for certain kinds of cancer in man.

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Solution

The correct option is A DNA is not present at any stage in the life cycle of retroviruses.
A retrovirus contains single-stranded RNA as the genetic material. It contains reverse transcriptase enzyme. It carries gene for RNA-dependent DNA polymerase. RNA is transcribed into DNA after entering a cell. This retroviral DNA integrates into the chromosomal DNA and replicates. This virus is a causative agent for certain kind of cancer in man.
Thus, the correct answer is option A.

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