My apologies, I'm not really putting much into my writing. It's probably not terribly clear.
Last comment in different words: If you took a post-bacc, I'm guessing you've had biochemistry and anatomy before. That will make things easier. My own major was heavy in molecular biology. This made molecular biology based subjects very easy for me.
Biochemistry and anatomy are not weighted as heavily as other subjects in medical school. They are relatively "low-yield" by comparison to physiology, pharmacology, and pathology. It's not that they aren't important, it's just that they're less emphasized.
Your school may stick to the essentials, which is a reflection of the lower weight in these subjects. Rejoice, because only a few specialties are heavily based in biochemistry: unless you end up in one of those, there wouldn't have been much point to learning more anyway. If you do end up in one of those specialties, you'll re-learn the necessary material in greater depth.
New comment:
If you find that you're being tested on "random facts," and are unhappy because you "don't understand" material, change the way you're learning. You may get lower grades, but you'll retain the information better. That's obviously more important to you. If it isn't, then I don't understand your complaint.