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Sarah Wagg 010404720 BI 211 October 21, 2002 The Origin of the Mitochondrion Introduction Cells of almost all eukaryotic organisms contain mitochondria. These organelles are vital to the process of aerobic respiration, the conversion of organic molecules to energy in the form of ATP.l. In some cases, there is a single, large mitochondrion, but more often, there are hundreds or thousands in a cell. The number is generally correlated with the metabolic activity of the cell. These and other membrane-bound organelles are not found in prokaryotic cells (those that lack a nucleus), though these more primitive organisms have respiratory membranes that are quite similar to those in mitochondria. This suggests that the mechanisms are very similar, leading to interest in tracing the evolutionary origins of the modern mitochondrion. In order to accomplish this, this paper focuses on the explanation of mitochondrial origins using molecular, genetic, and evolutionary approaches. There are very few papers that combine...

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