The endosymbiotic hypothesis for the origin of mitochondria (and chloroplasts) gave theory that that mitochondria is evolved from specialized bacteria (specifically purple nonsulfur bacteria) that somehow survived endocytosis by another species of prokaryote or some other cell type, and became assimilated into the cytoplasm.
Mitochondria is membrane-bound cell organelles which produce most of the chemical energy needed to power the cell's biochemical reactions.
Chemical energy generated by the mitochondria is stored in a small molecule known as adenosine triphosphate (ATP).
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