What are the functions of an enzyme in a metabolic reaction? (Choose all that apply.) bringing substrates closer together so they are more likely to react
binding to ions to form a substrate
lowering the energy it takes for a reaction to occur or speeding up a reaction
aligning the parts of substrates that need to connect to form a product.

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.