Retroviruses are implicated as a cause of cancer in humans because they:

Carry genes for reverse transcriptase

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May carry cellular protooncogenes in their genome

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May carry cellular v-oncogenes in their genome

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Carry single-stranded RNA as their genetic material

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Solution

The correct option is B
May carry cellular protooncogenes in their genome

Retrovirus is a virus that is composed of RNA. Retroviruses have an enzyme, called reverse transcriptase, that gives them the unique property of transcribing their RNA into DNA after entering a cell.

Retroviruses are implicated as a cause of cancer in humans because they may carry cellular proto-oncogenes in their genomes. When these proto-oncogenes get converted into oncogenes due to some chemical, physical or biological agents, they cause cancer.

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