1.5 The Origin of Cells

1.5 The Origin of Cells

1. Nature of Science

   • Cells only come from pre-existing cells
     • The first cells must have arisen from non-living material
     • Origin of eukaryotic cells
       • The endosymbiotic theory
         • Evidence
         • 64 codons in the genetic code have the same meanings in nearly all organisms
     • Pasteur's experiment on spontaneous generation
     • TOK
       • Systems approach versus Reductionist approach