nucleus is principal,ribosomes is vice principal Administrative assistant controls what enters and leaves the school, so the plasma membrane regulates what leaves and enters the cell. as the school floor holds all the desks and every thing thats on it, so the cytoplasm is were all the organelles and activities are found.er is like class room just as the janitors clean up all the trash so the lysosomes break down the cell waste so the differant parts can be reused cement support the school building, so the cytoskeleton supports and maintains the shape of the cell lunch provides the students with energy to do there work, so the mitochondria are the source of ATP that is used for energy in cell processes. composting breaks down garbege from the students in the school, so the peroxisomes break down hazardous material such as hydrogen peroxide ust as the buses drive kids to and from school, so the centrosome is were microtubes carry out transportation.