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OpenStudy (anonymous):

why does mitochondria have its own DNA?

OpenStudy (caozeyuan):

the underlying truth is not properly understood now, but the scientist speculates that it's because some bacteria once infected cells and incorporated into them

OpenStudy (dean.shyy):

Bacteria used to live in the mitochondrial cytoplasm and the DNA in the mitochondria are just remnants of such invasion by bacteria.

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