Viruses are not cellular organisms. They are packets of genetic material and proteins without any of the structures that distinguish prokaryotes and eukaryotes. SARS-CoV-2 is an example of a virus.

Is a virus one cell?

Viruses are not made out of cells. A single virus particle is known as a virion, and is made up of a set of genes bundled within a protective protein shell called a capsid. Certain virus strains will have an extra membrane (lipid bilayer) surrounding it called an envelope.

Are bacteria single-celled?

Unicellular organisms are made up of only one cell that carries out all of the functions needed by the organism, while multicellular organisms use many different cells to function. Unicellular organisms include bacteria, protists, and yeast.