The function of mitochondria is

The figure below shows the structure of a mitochondrion with its four parts labelled $A, B, C$ and $D$. Select the part correctly matched with its function.

Select the alternative giving correct identification and function of the organelle '$A$' in the diagram.

Mitochondria are the storehouses or powerhouses of

Organelles which are regarded as the “Powerhouse of the cell” and in which the oxidative reactions of the respiratory process take place are:

Mitochondrial $DNA$ is - ..........