Enzymes breaking down food

so some enzymes break down food and other molecules and convert it into energy but isn't that part of job the mitochodria job

Awesome, a question that is a genuine question, not a homework assignment!

Okay, so enzymes break down food into molecules that your cells can use. The mitochondria need a specific molecule in order to make energy. In order to get that specific molecule, enzymes in your body need to break down food into that molecule.

Think of it this way: mitochondria is a car. Cars need petroleum. The car isn't going to refine crude oil (which you get from the ground) into petroleum. No, a factory somewhere does this and delivers the type of fuel your car needs. The enzyme is like the factory that refines the crude oil into petroleum.

Some enzymes DO break down food into smaller pieces, but the conversion into energy-containing molecules (ATP) is the job of the mitochondria and the enzymes contained there. It's important to understand the difference between digestive enzymes and enzymes that are part of the respiratory pathway.

Enzymes break down food into molecules used in mitochondria to create energy, enzymes themselves dont release energy, they actually use it