Eukaryotic mitochondria have their own 70S ribosomes and circular DNA.

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Eukaryotic mitochondria contain their own 70S ribosomes and a circular DNA molecule that is distinct from the nuclear DNA found in the cell's nucleus. This is one of the key pieces of evidence supporting the endosymbiotic theory, which suggests that mitochondria were once free-living bacteria that were engulfed by early eukaryotic cells and eventually became a permanent part of their cellular machinery.

Eukaryotic Mitochondria Have Their Own 70S Ribosomes and Circular DNA