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

self-replication
duplication
multiplication
self-duplication

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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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