Mitochondrial $DNA$ is - ..........

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

$A$: Mitochondria are the powerhouses of the cell.
$R$: The sites of the Krebs cycle and oxidative phosphorylation in cellular respiration are within the mitochondria.

Which structure is/are considered as semi-autonomous organelle?

Select the correct option for the dimensions of mitochondria.

Which process occurs in the part labeled 'a' in the given figure?