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

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

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

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