Virus

Virus

A non-cellular microorganism that must infect a host cell to reproduce. A virus has two states: an intracellular state, when the virus may multiply and consists minimally of genetic material (double-stranded DNA, single-stranded DNA, double-stranded RNA, or single-stranded RNA); and an extracellular state, where the virus is also known as a viral particle or a virion, and has a protein coat in addition to the genome, and some viruses also have a lipid envelope.

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