Viral Structure Clinical Microbiology Review 277
TERM EXPLANATION
Virion
Nucleocapsid
Nucleic acid
Capsid
Envelope
Complete virus particle.Nucleic acid & capsid.DNA or RNA. Single- or double-stranded. Linear or circular.Protein coat that encloses genetic material. May be helical (rod-like) or icosahedral (cuboid). Composed of protein
subunits called capsomers. Protects nucleic acid, enables virus to attach to & enter host cell.Outer membrane surrounding capsid in some viruses. Aids in attachment to host cell. Viruses without called naked
nucleocapsids.