Which statement correctly describes a chemical reaction? O Reactants come out of a reaction.
O Energy is always released.
O Bonds between atoms break and reform.
O Products go into a reaction.

Mitochondria produce atp, a high energy compound. atp is used for all sorts of enzyme-mediated reactions, such as making proteins/nucleotides/etc, certain compounds cross the cell membrane, muscles move, etc.  without this source of energy, a cell will die. it will not be able to repair itself, defend against pathogens, etc.

The answer is b) gene