3. What effect does an enzyme have on a chemical reaction
within a cell?

Enzymes speed up the rate of a chemical reaction to help support life.But in Biochemical reactions , enzymes lower the activation energy of chemical reactions.

Note ;Activation energy is the energy needed to start a chemical reactio

Explanation:

Digestive enzymes which are secreted in the acidic environment which has a low pH of the stomach help break down proteins into smaller molecules. The main digestive enzyme in the stomach is pepsin.

Idont understand i'm sorry

Atp is is our little "pocket" of energy. of course, if you have too little, then it means you have too little energy, and you'll pass out. the way to not have enough, is to have no energy sources (glucose, fats, proteins). you can't have too many atp molecules. cycles like the krebs cycle produce it, but if you have too much of any substrate (or too little for that matter), the cycle stops and atp is no longer made (it stops until substrate levels are such that the process can go on). in any case, this is unlikely since atp is constantly hydrolyzed and remade, even while you're asleep. you won't have too much. if you have zero, you are dead or dying.