This is a little piece, spoofing SEED Magazine's cribsheet style, describing the structural components of an animal cell.
For those interested in bio-fuels, notice that all cell membranes and membrane-like structures are composed of phospho-lipids, that is, oily molecules attached to a phosphorus containing molecule. It is not economical to produce bio-fuel by grinding up animal cells; there simply isn't enough bio-mass. Besides, feral cats aren't so easy to catch in large numbers. However, simpler life forms like algae, fungi, and bacteria can be grown on an industrial scale, using cheap feed stocks to produce high-quality oils at a rate orders of magnitude higher than can be produced using oil seed crops like soy.