Viruses
Bacteriophages have been used widely in genetic research, since they are the smallest and simplest biological entities capable of

duplication
self-replication
self-duplication
multiplication

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

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