Mitochondria

Mitochondria are the membrane bound organelles. They are found in the eukaryotic cells. The size of mitochondria ranges from 1-10 micrometers. The outer surface of mitochondria is smooth but the inner surface has folds known as cristae. They increases the inner surface area. It is the cristae where the food combine with oxygen which results in the formation of ATP which is the chief source of energy in our body.That is why mitochondria are also called as the power house of cell.
Mitochondria are the unique organell in our body. They have their own genome. That is why the clones can not be totally similar to that of parent. The number of mitochondria varies from organism to the type of tissues.