if i were you i would take some more undergrad classes. if you start into a graduate work (maters degree, etc) most med schools will want you to finish that work before you matriculate into med school. also, i believe that a graduate gpa is seperate from the undergrad gpa, they dont combine them together. one A at this point wont make much of a difference in your overall gpa provided that you have already taken many science classes, although it obvioiusly wont hurt you. also, that A does look good on your transcript. hope this helps!