I’d say you can’t really go wrong, but I would recommend AP Physics. You should be fine in either AP physics 1, or AP physics C, you are in BC so the content shouldn’t be too troubling overall. Seeing as you also have no prior physics, it would be a good way to round out the science end of your curriculum. Biology wouldn’t be a bad choice, especially since you do want to do biochemistry, and if you are up for it and your schedule allows, you could attempt both. Best of luck