Microbiology 9th Edition by Laura Black, Jacquelyn Black

Exercise 16

According to the endosymbiotic theory, the organelles of eukaryotic cells arose from prokaryotic cells that had developed a symbiotic relationship with the eukaryote-to-be. Strong evidence supporting the theory comes from a comparison of prokaryotic organisms to eukaryotic organelles (especially mitochondria, chloroplasts, and ribosomes). Can you think of any other evidence supporting the theory?