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  • pathogens
    • viruses
      • e.g. cold, influenza, measles, HIV, tobacco mosaic virus
      • DNA or RNA surrounded by a protein coat
      • are not cells
      • 1/100th the size of a bacterium
    • bacteria (prokaryotes)
      • e.g. tuberculosis (TB), salmonella, gonorrhea
      • no membrane bound organelles
        • (no chloroplasts, mitochondria or nucleus)
      • single celled organisms
      • 1/100th the size of a body cell
      • make you feel ill by producing toxins that damage cells and tissues
    • protists (eukaryotes)
      • e.g. dysentery, sleeping sickness, malaria
      • membrane bound organelles
        • usually single celled
    • fungi (eukaryotes)
      • e.g. athletes foot, thrush, rose black spot
      • membrane bound organelles, cell walls made of chitin
      • single celled or multi-cellular
      • others have a body made up of hyphae (thread like structures)
        • these grow and penetrate human skin and the surface of plants
        • can produce spores


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