What current microbe most resembles the universal ancestor?
Proposal that some organelles were once free-living organisms that established a symbiotic relationship with eukaryotes
evidence of the endosymbiont hypothesis
--both mitochondria and choloroplasts are about the size of prokaryotic cells (1-5 micrometers in diameter)--both have a double membrane; the outer possibly coming from the host cell and the inner from the guest cell --both have enzymes to synthesize ATP --both possess DNA and ribosomes --anything that's not bacterial have mitocondria --anthing green has chloroplasts (eukaryotic algae)
can bacteria exist in multicellular forms?
yes. slime mold is one ex., bacterium can form large, multicellular structure
photosynthetic bacteria and chloroplast association
lots of photosynthetic membrances. modern day photosynthetic bacteria entered into bigger cellto become chloroplasts. became organelles.
similarities between nitrosomonas and mitochondria