What are the infoldings of the inner mitochondrial membrane called?

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

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

Microtubules are absent in which of the following?

$F_1$ particles / oxysomes / elementary particles are present in:

Cellular energy is provided through respiration and oxidation by