NEET 2004 Biology question

Which of the following statements is not true for retroviruses :-

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

Answer: (4)

Solution

Retroviruses (e.g. HIV, HTLV) have RNA as their genetic material and carry the gene for reverse transcriptase (RNA-dependent DNA polymerase), which synthesises a DNA copy (cDNA, then double-stranded provirus DNA) that integrates into the host genome. Some

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Question ID VK-089464