I'm beginning the wondrous process of applying to graduate schools. Long story short in my last semester of undergrad stuffs I took Modern Optics instead of taking Quantum Mechanics II. Modern Optics is still a 400 level course but at the time I wasn't considering applying to physics graduate programs, only material science. After a while I realized Oh! I actually want to apply to physics programs for biophysics instead. Sooo because of that decision to not take QM II, I'm wondering how much of a set back that put me in. I know it's not horrendous but I'm just wondering how much the admission councils will look at that as a reason not to admit me.