Eukaryotic cells originated approximately __ years ago. They differ from prokaryotic cells in that they contain a membrane-bound __ , in addition to other organelles. The nucleus is thought to have evolved due to an invagination of the __ . The __ , organelles that synthesize ATP, and the __ , organelles that synthesize glucose, are thought to have evolved from __ . The __ suggests that these __ were engulfed by another cell. However, instead of being consumed, a __ occured and they became organelles. This theory of the origin of organelles is called the __ .

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.