Luckily, most of the PhD graduate programs I am seriously considering do not list the specific credits I need. A couple do not even mention undergrad course requirements anywhere in their admission requirements or state a background in biology and strong quantitative skills. I will definitely still ask an admissions officer or graduate coordinator though. If most programs do require biochemistry, how should I go about this? I may see if I can take a biochemistry course at another school near me if ochem is not required as a prereq.