Mitochondria have a double membrane structure, with the inner membrane being highly folded.
Mitochondria are the primary energy producers in cells.
Structure Mitochondria have a double membrane structure. There is a single outer membrane and a folded inner membrane. This results in a sac with two inner compartments which are seperated by the inner membrane. The first compartment is between the outer and inner membranes, the outer compartment is inside the inner membrane. Function Mitochondria are the site of most of the energy production in eukaryotic cells.