Why do adult stem cells currently have fewer uses in therapeutic cloning than embryonic stem cells? A. Adult stem cells have more restrictions that prevent them from reentering the cell cycle at the G0 stage. B. Embryonic stem cells have longer telomeres and persist for much longer than adult stem cells. C. Adult stem cells may become any type of cell, whereas embryonic stem cells may only become adult stem cells first. D. Embryonic stem cells may become any type of cell, whereas adult stem cells may only become a limited number of cell types

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.