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

multiplication
duplication
self-replication
self-duplication

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Viruses
The function of a viral capsid is

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

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