Mitochondria
Mitochondria are surrounded by two membranes and have their own genome. Their devision is not realted to cell devision, even though they are in the cell. The inner membrane is filled with proteins that help in electron transport and ATP synthesis. (http://www.nature.com/scitable/topicpage/mitochondria-14053590)
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http://micro.magnet.fsu.edu/cells/mitochondria/images/mitochondriafigure1.jpg
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