Viruses only- Capsid, Capsomere (core protein), Envelope with glycoproteins
Host cell only- Ribosome
Both- Protein, RNA, DNA
A virus is a submicroscopic infectious agent that replicates only within an organism's living cells. Viruses infect all forms of life, including animals and plants, as well as microorganisms such as bacteria and archaea.
When infected, a host cell is frequently forced to produce thousands of copies of the original virus in a short period of time. These virus particles range in shape from simple helical and icosahedral structures to more complex structures. Most virus species have virions that are one-hundredth the size of most bacteria and are too small to be seen with an optical microscope.
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