Viruses
The viruses in an attenuated vaccine

have no genome
continue to replicate
are usually larger than bacteria
is altered with chemicals

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Viruses
The function of a viral capsid is

providing binding sites that enable the virus to attach to specific receptor sites on the host cell
All of these
serving as a vehicle of transmission from one host to another
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?

All viruses have either DNA or RNA as their genetic material
Viruses have been successfully grown in pure cultures in test tubes
Viruses probably arose from small fragments of cellular chromosomes
All viruses are obligatory intracellular parasites

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