Don't memorize ANY of them, seriously. We told our students before the first MCAT that they would need to have a committed understanding of the reactants, intermediates and enzymes for the major metabolic pathways on the AAMC topics list. Plenty of indicators were there that this would be the case, but many/most other prep resources were saying you wouldn't need intermediates or enzymes. The newest AAMC practice questions just released and the new scored AAMC exam have proven this to be the case--you'll need to understand all of them. Nope, I didn't contradict myself. I did say do not memorize any of them, because if you are only memorizing you are not preparing for what MCAT-2015 really is and how it will test you. There is a plague here on SDN of everyone trying to make lists of what to memorize. You could memorize them and MAYBE find one question on your whole exam where having rote memory of the name of an enzyme could get you the question right. However, you'll be in trouble on every other question. Instead, study those mechanisms until they become intuitive, like riding a bicycle. Until they make sense. Once you really understand something you will always remember it if simple recall is required, but you'll ALSO be able to USE that information to analyze, predict, synthesize, etc.--which is the kind of thinking you'll actually doing all the time on the MCAT. Memorized stuff will NOT get you those points and will never get you an awesome score. Good luck! [Know-not-memorize fatty-acid-oxidation as it's more common and more likely to show up; for PPP keep it more simple, only know the basic story/players]
