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Viruses are not alive by most definitions. They are generally smaller than most bacteria, about a tenth of the size of a human blood cell.Β
The structure of a virus is very simple: Each one consists of either DNA or RNA, enclosed in a protein pocket called a capsid. Viruses can't generate their own energy nor reproduce without the assistance of a host.
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Viruses cannot move or reproduce without the help of a host cell. When a virus finds a host, it can increase and spread quickly.
To find a host, viruses have receptors on their surfaces that match up with their ideal target cell. It then takes over the cellular machinery inside the host's cell to reproduce by multiplying the virus's genetic material and proteins.
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