Endosymbiotic theory for the origin of mitochondria (and chloroplasts) suggests that mitochondria are descended from specialized bacteria.
Endosymbiotic theory States that organelles such as chloroplasts and mitochondria were once free-living prokaryotes which eventually lived symbiotically within larger cells, forming modern day eukaryotes.
Endosymbiotic theory also state that some eukaryotic cell organelles, such as mitochondria and plastids, evolved from free-living prokaryotes. Mitochondria originated from purple non-Sulphur bacteria. These endosymbionts became organelles through the origin of complex protein structure into their inner membranes .
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