Viruses
Which of the following viruses can rescue adenovirus in simian cells?

Vaccinia
Rabies
Simian virus 40
Cytomegalovirus

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Viruses
The function of a viral capsid is

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

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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
Viruses probably arose from small fragments of cellular chromosomes
All viruses are obligatory intracellular parasites

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