I disagree. I took the test in january and I remember that after taking the test, and still today, that an overwhelming majority of the problems came from information specific to that passage/situation. Sure, that doesn't mean don't study bio at all, it just means don't spend your time studying every single minutia about each bio topic. Personally, I think your time should be spent practicing passages in bio, and focus more heavily on verbal and PS where you can pick up points.
If you have the official guide by AAMC, look at some of the passage information and question within that guide. It is a very good indicator of the material on the exam. When you answer the questions, you'll see that the way to answer the questions is to apply what is in the passage, not rely on background info that you memorized.