First year physics majors here are required to take one year of another science. I chose chemistry, but now I wish I had chosen biology. Say, if I got to grad school and had an interest in biophysics would I be sunk because I haven't taken a single bio course since senior year, high school? Would I just end up taking some bio courses from that department before? Can you learn biophysics without taking any formal courses (perhaps assuming you're willing to put in some time to learn basics on your own)? Would computational biophysics make a difference?