Bacteria vs Viruses (structural differences)

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  • Bacteria vs Viruses (structural differences)
    • Bacteria
      • Average diameter - 0.5-5 micrometers
      • Do not have:
        • a nucleus
        • membrane-bound organelles
        • spindle fibre formation during cell division
      • In the cytoplasm (inside the cell surface membrane)
        • Circular DNA
        • Plasmids
        • Ribosomes
          • protein synthesis occurs freely in cytoplasm
        • Mesosomes
          • Infolding of the CSM - site of cell respiration
      • Out of the cytoplasm
        • Cell surface membrane
        • Cell wall
          • Made of peptidoglycan - NOT CELLULOSE
        • Flagellum
          • For motility
        • Pilus
          • Protein tubes allowing for attachment to surfaces and other cells
        • Capsule
          • Prevents dehydration and allows to form colonies
    • Viruses
      • Diameters range from 10-300 nanometers
        • (far smaller than bacteria)
      • Basic structure entails:
        • Nucleic strand (RNA or DNA)
        • Protein coat
      • require a host to reproduce
        • Disrupts infected cell biochemistry
        • The lysis of infected cells spreads the virus to neighbouring cells
          • this process vauses the disease symptoms of the virus


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