The Co RR hypothesis proposes that this co-location is required for redox regulation.
The mitochondrial genome codes for some RNAs of ribosomes, and the 22 t RNAs necessary for the translation of m RNAs into protein.
A mitochondrion contains DNA, which is organized as several copies of a single, usually circular, chromosome.
However, this is now known to be an artifact of long-branch attraction—they are derived groups and retain genes or organelles derived from mitochondria (e.g., mitosomes and hydrogenosomes).
Mitochondrion ultrastructure (interactive diagram) A mitochondrion has a double membrane; the inner one contains its chemiosmotic apparatus and has deep grooves which increase its surface area.
A number of unicellular organisms, such as microsporidia, parabasalids, and diplomonads, have also reduced or transformed their mitochondria into other structures. 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.
Although most of a cell's DNA is contained in the cell nucleus, the mitochondrion has its own independent genome that shows substantial similarity to bacterial genomes.