After completion of an undergraduate degree, is it possible to take classes such as Biochemistry just to fulfill medical school requirements?

Is it possible to take required classes like Biochemistry even after graduation and still count when you apply to medical schools? I'm also an international student, but I'd want to pursue a Master's in the US first in my field before I apply to medical school, so I'm thinking of postponing Biochem, Genetics until I have graduated.
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Pre-Medical - MD Source Type: forums