Viruses
The extracellular phage number increases until a constant titer at the end of the multiplication cycle. This time interval is termed as

eclipse period
rise period
burst size
latent period

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

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