Viruses
During the first 10 minutes after injection of phage DNA, no phage can be recovered by disrupting the infected bacterium. This is termed as

rise period
eclipse period
burst size
latent period

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

Viruses probably arose from small fragments of cellular chromosomes
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

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