Viruses
The repressor protein, since the cell is resistant to lysis from externally infecting phage, is also called

immunity repressor
none of these
immunity operon
operon repressor

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Viruses
The function of a viral capsid is

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
protection against the viral genome from physical and enzymatic destruction

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