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from class: Microbiology Definition A virion is a complete virus particle that consists of an RNA or DNA core with a protein coat and, in some cases, other layers. It is the extracellular form of a virus that can infect host cells.
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Predict what's on your test 5 Must Know Facts For Your Next Test Virions are responsible for the transmission of viral genetic material between hosts. They can be composed of either single-stranded or double-stranded RNA or DNA. The protein coat surrounding the nucleic acid is known as a capsid. In some viruses, the virion also includes an envelope derived from the host cell membrane. Virions are not capable of metabolic activity and must infect a host cell to replicate. Review Questions What are the main structural components of a virion? How do virions differ from viruses inside host cells? Why can't virions replicate on their own?
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