2008-08-05, 10:52 AM
One of the hardest classes I've taken was a course on metabolism. It involved memorizing like you would not imagine. Take every single major metabolic pathway in living organisms (glycolysis, kreb's cycle, fatty acid synthesis, urea cycle, etc. etc.) and memorize all the intermediate chemical structures along with enzymes and reactants and products as they enter and leave the pathways. Fun fun. So glad I'm done with biochemistry lol.