SIze comparison of microorganisms Meters Visibility scale Relative size of microbes 103 1,000um 1 mm ked eye Prokaryotes 10-4 100pm 10-5 lO um Bacillus megaterium 6 1.000 nm or Eukaryotes 1 um Escherichia coli 10-7 100nm Light microscope Mycoplasma 0810nm Virus Viruses 10-9 1 nm Electron microscopesize comparison of microorganisms Meters Visibility scale Relative size of Microbes Prokaryotes Eukaryotes Viruses Naked eye Light microscope Electron microscope