Cristae helps in

Which statement is correct regarding mitochondria?

$P -$ 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.

The prokaryotic origin of mitochondria was proposed by

Which of the following is known as the centre of phosphorylation?

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.