Viruses
Viruses can be purified based on their size and density by using

differential centrifugation
precipitation
gradient centrifugation
none of these

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

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