I disagree with Relatively Prime. Schools, especially if you are talking to admissions officers (not the secretary), will, or at least should, give you advice based on your scenario. Two separate cases:
A friend had good grades, lots of research and some clinical experience and probably great LORs. Then she took the MCAT and bombed it (in the mid-20s range). She called her first choice school, which happened to be the state school, and told them the dilemma. They told her that based on all of her ECs and grades, that her score would not preclude an interview and real consideration before the adcom (she did get an interview).
Another friend had an awesome application. Grades, LORs, experience, research...the whole nine yards. Wanted to go into MD/PhD. Took the August MCAT and bombed it (low to mid-20s). Called every single school he had applied to (he had already sent his AMCAS), and each one of them told him that he needs to withdraw his application, take the MCAT again, and apply next year (which he did, and ended up getting into several MD/PhD programs).
Point: if you talk to the right people in the admissions offices of the schools you are applying to, you will get answers. They may not be the answers you like to hear, but they should be honest with you.
Yesm, as long as you have an otherwise strong applicaton (great ECs, great LORs, and a great personal statement) you should be fine. Just build up that GPA by kicking ass in upper division science courses this coming year.
Good luck! :wink: