SIze comparison of microorganisms Meters Visibility scale Relative size of microbes 10-3 1,000 um or 1 mm Naked ey Prokaryotes 100m 10 um Bacillus megaterium 1,000 nm-o 10 1 um Eukaryotes Escherichia co‖ 10+100nm Light microscope Mycoplasma 10-8 10 nm Virus Viruses 1 n Electron mIcroscopesize comparison of microorganisms Meters Visibility scale Relative size of Microbes Prokaryotes Eukaryotes Viruses Naked eye Light microscope Electron microscope