Viruses
The most popular indirect method of counting virus particles is by

hemagglutination assay
plaque-assay
counting plaque-forming units
colony counting

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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
All viruses are obligatory intracellular parasites
Viruses probably arose from small fragments of cellular chromosomes

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