Viruses
Which of the following viruses has not been associated with human cancer?

Herpes simplex virus type 2
Hepatitis B virus
Varicella-Zoster virus
Hepatitis C virus

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

All viruses are obligatory intracellular parasites
Viruses have been successfully grown in pure cultures in test tubes
Viruses probably arose from small fragments of cellular chromosomes
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 viruses 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 viral hosts than between viruses and their hosts

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