Viruses
Which of the following viruses show/s transformation of infected cells?

Hepatitis B virus
All of these
Human T cell lymphotronic virus type I
Epstein-Barr 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
All viruses have either DNA or RNA as their genetic material
Viruses probably arose from small fragments of cellular chromosomes

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