Viruses
Plant viruses may be cultivated in

tissue culture
whole plants
all of these
cultures of separated cells

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

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
Viruses have been successfully grown in pure cultures in test tubes

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