Ribosomes Present Absent
Cell wall Peptidoglycan / Lipopolysaccharide No cell wall. Protein coat present instead.
Living attributes Living organism Opinions differ on whether viruses are a form of life or organic structures that interact with living organisms.
Introduction (from Wikipedia) Bacteria constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria have a number of shapes, ranging from spheres to rods and spirals. A virus is a small infectious agent that replicates only inside the living cells of other organisms.
Nucleus No No
Number of cells Unicellular; one cell No cells; not living