Viruses
Which of the following viruses belong to family Flaviviridae?

Rubella virus
Hepatitis C virus
Yellow fever virus
All of these

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

Viruses probably arose from small fragments of cellular chromosomes
All viruses have either DNA or RNA as their genetic material
Viruses have been successfully grown in pure cultures in test tubes
All viruses are obligatory intracellular parasites

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