Some short notes on endosymbiotic theory

HideShow resource information


  • Eukaryotic cells - presence of internal membranes and organelles - lacking in bacteria and archaea. 
  • Suggested that to 2 membranes that chloroplasts contain derive from the endosymbiotic procedure itself:
  • the inner membrane derives from the prokaryote ancestor.
  • the outer membrance derives from the vacuolar membrane of the eukaryotic cell which was involved in engulfing the endosymbiont. 
1 of 3

Endosymbiotic Theory

  • Ancestral Eukaryotic cell engulfs an aerobic bacterium (mitochondria).
  • It then engulfs a photosynthetic bacterium to form endosymbiosis to form plant cells. 
2 of 3

Ivan Wallin proposed that mitochondria may have be


  • Mitochondria and chloroplasts are similar in size and morphology to prokaryotes.
  • Both reproduce by binary fission as do bacteria.
  • Organelles can only arise from pre exsisting organelles.
  • Mitochondria and chloroplasts have their own DNA.
  • Organellular DNA resembles those of bacteria (DNA phylogeny)
  • Organelles contain their own ribosomes.
  • Differences in the composition of the 2 membranes.
  • Organelles can be targetted by antibiotics specific to prokaryotes. 
3 of 3


No comments have yet been made

Similar Biology resources:

See all Biology resources »See all resources »