Endosymbiosis Some short notes on endosymbiotic theory 3.0 / 5 based on 1 rating ? BiologyUniversityAll boards Created by: Amy AbbottCreated on: 07-01-13 10:41 Endosymbiosis 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 Evidence 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
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