The mitochondrial RNA polymerase of human cells is related to the T7 bacteriophage RNA polymerase. This appears, therefore, to be a case of

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The similarity between the mitochondrial RNA polymerase of human cells and the T7 bacteriophage RNA polymerase is an example of horizontal gene transfer, a process where genetic material is transferred between unrelated species, rather than being passed down from parent to offspring. This can occur through various mechanisms and is a significant factor in the evolution of many organisms, including the development of mitochondria in eukaryotic cells.

The Mitochondrial RNA Polymerase of Human Cells Is Related to the T7