- They are small rod-shaped organelles.
- It is a double membrane structure with outer membrane being smooth and porous whereas inner membrane being thrown into a number of folds called cristae.
- They contain their own DNA and ribosomes.
- They are absent in bacteria and red blood cells of mammals.
They are the sites of cellular respiration, hence provide energy for the vital activities of living cells.
They store energy releases during reactions, in the form of ATP (Energy currency of the cell). Therefore, they are also called ‘power house’ of the cell.