Cristae are associated with which of the following?

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

Organelles which are regarded as the $Power house$ of the cell and in which the oxidative reactions of the respiratory process take place are

Mitochondria supply most of the necessary biological energy by

In the given figure of a mitochondrion,which alphabet indicates the location of the matrix where circular $DNA$ is present?

$ATP$ is formed in