Virions

Definition

Virions are the complete, infective form of a virus outside a host cell. They consist of genetic material (DNA or RNA) enclosed in a protein coat called a capsid, and sometimes an outer lipid envelope.

5 Must Know Facts For Your Next Test

1. Virions are the extracellular form of viruses, capable of infecting host cells.
2. The genetic material in virions can be either DNA or RNA, but not both.
3. A virion's capsid is composed of protein subunits called capsomeres.
4. Some virions have an additional lipid envelope derived from the host cell membrane.
5. Virions play a crucial role in the transmission and infection cycle of viruses.

Review Questions

Related terms

Capsid: The protein shell that encloses the genetic material of a virus.

Envelope:

A lipid membrane that surrounds some types of virions, derived from the host cell membrane.

Capsomere: Protein subunits that make up the capsid of a virus.