I beleive that in Biology, it is not really what you study that is important. What is important is that you learn how to learn, that you learn how to find info for yourself, and how to ask the proper questions. THe science then is not important, because whatever the science you learn, if you like it and if you have the enthousiasm, you will be motivated to work in it and this enthousiasm will fuel a great deal of ideas. What I am saying is that your future job might not have anything to do with what you are going to study now. I know countless of people, including me, who have studied one thing and ended up working in another area.
Microbiology is also really important.
I suggest that whatever you choose, choose something you like. I hope that helps. All rights reserved.