Viruses
A change from lysogeny to lysis is generally induced by

all of these
irradiation
ultraviolet light
chemicals

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

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