Which of the following organelles contains a system of folded membranes?

In mitochondria,cristae act as sites for

Which of the following is a correctly matched pair?

Assertion $A$: Mitochondria are the powerhouse of the cell.
Reason $R$: The sites for cellular respiration,specifically the $Krebs$ cycle and oxidative phosphorylation,are located within the mitochondria.
Which option is correct for Assertion $A$ and Reason $R$?

Mesosomes were taken as the equivalent of which cell organelle in prokaryotes?

On which structure are the $F_0-F_1$ particles of oxysomes located?