What causes a protein to migrate on sds-page in such a way that it appears to be a protein that is much bigger

SDS-PAGE is used for separation of proteins or protein fragments based on their size. SDS is an ionic detergent that denatures and binds to proteins. Consequently, the proteins are negatively charged. An electric current is running through the gel in the electrophoresis with positive pole on the bottom. Since proteins are negatively charged, they migrate toward the positive pole of the gel. Some of the proteins are smaller so they can travel more quickly through the gel than the bigger proteins. 

He should put sand around the spill in order to contain it so that it won't spread

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.