Viruses
The first step in infection of a host bacterial cells by a phage is

penetration
replication
absorption
adsorption

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

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Viruses
The oncogene theory refers to

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

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