Two types of cells

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  • Two types of cells
  • Prokaryotic
  • Eukaryotic
  • single cell organisms
    • examples:
      • bacteria
        • most abundant organisms on earth
      • archaeans
        • many unusual characteristics
        • can live in extreme habitats
  • single cell organisms
    • examples:
      • yeast
        • produces CO2
      • amoeba
      • paramecium
      • diatom
    • don't have specialized cells + tissues
  • multi cell organisms
    • human beings
    • have specialized cells + tissues
  • earliest life forms on earth
  • stromolites
    • rock deposits
  • still do carry out the 7 characteristics of life
  • contains DNA
    • usually exists as a looped molecule
  • the nucleus contains the DNA
  • scientists suggest eukaryotes arose from prokaryotes
    • endosymbiotic theory
  • no nucleus or membrane bound organelles
  • contain a nucleus + membrane bound organelles

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