What is the powerhouse of the animal cell

The Mitochondria is the powerhouse of all cell body's plant and animal.  Very few cell bodies don't have mitochondria.

Explanation:

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme