The fluid-filled matrix present inside the mitochondria is called .......

What is the energy currency of the cell?

Which of the following cell organelles is responsible for extracting energy from carbohydrates to form $ATP$?

Which of the following is a self-replicating organelle?

Read the statements $P$ and $Q$:
$P$: The number of mitochondria in each cell does not depend on the physiological activity of the cell.
$Q$: Mitochondria are present in both plant and animal cells.
Select the correct option from the given choices.

The matrix of the mitochondrion contains .......