Shrike: No. Or so seems to be the consensus.

jmugele: As I posted before, I think a person could get away without taking genetics. But I think the opposite is true for organic chemistry. Although there’s not a whole lot of orgo on the MCAT (although, that probably depends on the specific test — I’m guessing it’s roughly the same amount of material as genetics), organic chemistry is much more complex conceptually. I also found that a good organic chemistry class teaches you some really good abstract problem-solving skills that are helpful for test-taking in general. But overall, because orgo is so complex and because there is a lot of memorization, I think a class helps before the MCAT.

QofQuimica: No, as with physics, I believe it is best to have at least completed Organic I before taking a prep course or starting self-study, and ideally Organic II as well. It is fine though if you are still taking Organic II while you study for the MCAT.