Mitochondria originated from proteobacteria.

Question

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According to the endosymbiotic theory, mitochondria evolved from an ancient free-living proteobacterium that formed a symbiotic relationship with a host cell. This theory is supported by several lines of evidence, including the fact that mitochondria have their own DNA, which is similar in structure to bacterial DNA, and that they reproduce independently within the cell, similar to how bacteria reproduce. Additionally, the outer membrane of mitochondria is similar in composition to the cell membranes of proteobacteria.

Mitochondria Originated from Proteobacteria