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.
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 ...
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