Mitochondria. Transmission electron micrograph of mitochondria from a mouse kidney cell. The large circle is a slice through a single mitochondrion. Note the double outer membrane and numerous internal membranes, or cristae, where respiration takes place. Mitochondria provide cells with energy by oxidising sugars and fats. They are found in almost all cells, have their own DNA (deoxyribonucleic acid) and replicate autonomously. They are thought to have originated from parasitic bacteria that invaded primitive cells and became symbiotic. Magnification x135,000 at 10x8 inch size.
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