Viruses
The oncogene theory refers to

how viruses transform normal cells into tumor cells
none of these
how viruses replicate in host cells
how chemicals inactivate viruses when applied

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Viruses
The sequence of nucleic acid in a variety of viruses and viral host, will find more similarities

among different viral hosts than between viruses and their hosts
between viruses and their hosts than among different viruses
among different viral hosts than among different viruses
among different viruses than between viruses and their hosts

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