Viruses
Which of the following may affect proteins and nucleic acids, but not viruses?

Pressure
Denaturation
All of these
Enzyme treatment

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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
All viruses are obligatory intracellular parasites
Viruses have been successfully grown in pure cultures in test tubes

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