<P> 4 Mitochondrial DNA 5 Matrix granule 6 Ribosome 7 ATP synthase </P> <P> The mitochondrion (plural mitochondria) is a double membrane - bound organelle found in all eukaryotic organisms . Some cells in some multicellular organisms may however lack them (for example, mature mammalian red blood cells). A number of unicellular organisms, such as microsporidia, parabasalids, and diplomonads, have also reduced or transformed their mitochondria into other structures . To date, only one eukaryote, Monocercomonoides, is known to have completely lost its mitochondria . The word mitochondrion comes from the Greek μίτος, mitos, "thread", and χονδρίον, chondrion, "granule" or "grain - like". Mitochondria generate most of the cell's supply of adenosine triphosphate (ATP), used as a source of chemical energy . </P> <P> Mitochondria are commonly between 0.75 and 3 μm in diameter but vary considerably in size and structure . Unless specifically stained, they are not visible . In addition to supplying cellular energy, mitochondria are involved in other tasks, such as signaling, cellular differentiation, and cell death, as well as maintaining control of the cell cycle and cell growth . Mitochondrial biogenesis is in turn temporally coordinated with these cellular processes . Mitochondria have been implicated in several human diseases, including mitochondrial disorders, cardiac dysfunction, heart failure and autism . </P> <P> The number of mitochondria in a cell can vary widely by organism, tissue, and cell type . For instance, red blood cells have no mitochondria, whereas liver cells can have more than 2000 . The organelle is composed of compartments that carry out specialized functions . These compartments or regions include the outer membrane, the intermembrane space, the inner membrane, and the cristae and matrix . </P>

What is the function of mitochondrion in a plant cell