The organelle in which the oxidative process of respiration occurs is known as ......

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.

Which organelle is known as the powerhouse of the cell?

Food is converted to energy in

$P -$ Assertion: The inner membrane of the mitochondria forms a number of infoldings called cristae,which contain $F_1$ particles.
$Q -$ Reason: Cristae contain the components necessary for oxidative phosphorylation.

Which of the following structures contains its own $DNA$?