The evolution of eukaryotic cells most likely involved: endosymbiosis of an oxygen-using bacterium in a larger host cell−the endosymbiont evolved into mitochondria. evolution of an endomembrane system and subsequent evolution of mitochondria from a portion of the golgi. endosymbiosis of an oxygen-using photosynthetic bacterium in a larger host cell−the endosymbiont evolved into mitochondria. endosymbiosis of an oxygen-using scavenger bacterium in a larger host cell−the endosymbiont evolved into lysosomes.

The endosymbiotic theory states that both mitochondria and chloroplast are eukaryotic organelles that were once free living aerobic prokaryotes (bacteria) which were ingested by anaerobic bacteria.

The endosymbiotic theory is supported by several lines of evidence:

In conclusion, the evolution of eukaryotic cells most likely involved endosymbiosis of an oxygen-using bacterium in a larger host cell−the endosymbiont evolved into mitochondria.

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