Which organelle is the powerhouse of the cell, the site of cellular respiration?

a. 2 - nucleus

b. 5 - endoplasmic reticulum

c. 6 - golgi bodies

d. 9 - mitochondria

D. The mitochondria of the eukaryotic cells are the sites of cellular respiration and where most of the steps take place. Cellular respiration allows for the release of energy stored in chemical bonds of glucose (obtained from food) to form adenosine triphosphate, which is the energy currency of the cell.