Viruses
Bacteriophages have been used widely in genetic research, since they are the smallest and simplest biological entities capable of

duplication
self-replication
self-duplication
multiplication

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Viruses
The function of a viral capsid is

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
All of these

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Viruses
In order for a virus to replicate

the genome must be released in the cytoplasm
the host cell must be undergoing mitosis
the capsid must enter the host cell cytoplasm
the host cell must lack a cell membrane

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