Viruses
The envelope of which of the following viruses is derived from the host cell nucleus?

Orthomyxoviruses
Retroviruses
Paramyxoviruses
Herpesviruses

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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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