Viruses
Which of the following statements is not true of viruses?

Viruses have been successfully grown in pure cultures in test tubes
All viruses have either DNA or RNA as their genetic material
Viruses probably arose from small fragments of cellular chromosomes
All viruses are obligatory intracellular parasites

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

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Viruses
In order for a virus to replicate

the genome must be released in the cytoplasm
the host cell must be undergoing mitosis
the host cell must lack a cell membrane
the capsid must enter the host cell cytoplasm

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