Which statement is true about the plasma membrane?
a. the proteins make up the matrix of the membrane.
b. the model can be likened to a sandwich where phospholipids are like the bread and proteins are like the filling.
c. the fluid nature of the membrane is regulated by flip-flopping of the phospholipids from one side of the membrane to the other.
d. proteins and phospholipids can move sideways within the plane of the membrane.

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.