My university had a 3cr Biochemistry that was meant to cover all of Biochemistry I and II in a condensed, less detailed form. They also offered Biochemistry I and II separately, obviously. I'm extremely happy that I decided to take I and II! It helped exponentially on the MCAT and in addition, Biochemistry turned out to be one of (if not my #1) my favorite classes! I would recommend taking I and II!!