Viruses
Which of the following oncogenic viruses was first detected?

Epstein-Barr virus
Human T cell leukaemia virus
Rous sarcoma virus.
Herpes simplex virus type 2

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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
Viruses probably arose from small fragments of cellular chromosomes
All viruses have either DNA or RNA as their genetic material
All viruses are obligatory intracellular parasites

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