Mitochondrial inner membrane encloses $ . . . . . . $.

Which of the following is the phosphorylating unit?

What is the approximate percentage of mitochondrial $DNA$ in a typical eukaryotic cell relative to the total cellular $DNA$?

Give scientific reason: Mitochondria is called the powerhouse of the cell.

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

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.