Biology / Bio 1901 · Atom · ~20 seconds
Virion Structure: Genome, Capsid, and Envelope
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A virion holds a nucleic acid genome inside a protein capsid, sometimes wrapped in a lipid envelope taken from a host cell.
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Influenza's genome sits inside an enveloped capsid; poliovirus's genome sits inside a capsid alone, with no envelope.
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A virion has no ribosomes or organelles of its own— any envelope it carries is borrowed from a host cell.