Viruses
The envelope of which of the following viruses is derived from the host cell nucleus?

Paramyxoviruses
Herpesviruses
Retroviruses
Orthomyxoviruses

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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
protection against the viral genome from physical and enzymatic destruction
serving as a vehicle of transmission from one host to another
All of these

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