Oxidative enzymes occur mostly in

The cellular furnace of the cell is $......$.

Assertion : Mitochondria and chloroplasts are semi-autonomous organelles.
Reason : They are formed by division of preexisting organelles as well as contain $DNA$ but lack protein-synthesizing machinery.

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.

The cristae of mitochondria possess:

Which of the following statements is $NOT$ true for the mitochondrial membrane?