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

latent period
eclipse period
rise period
burst size

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Viruses
The function of a viral capsid is

protection against the viral genome from physical and enzymatic destruction
providing binding sites that enable the virus to attach to specific receptor sites on the host cell
serving as a vehicle of transmission from one host to another
All of these

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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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