Viruses
A change from lysogeny to lysis is generally induced by

chemicals
all of these
ultraviolet light
irradiation

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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
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

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