Alright then. My unspoken concern was that you had uniformly mentioned "I want to do X type of research" in a personal statement and then applied to schools, not checking whether or not they had faculty doing research in that area. However, the point above about you seeming indecisive has some validity, although not because you applied to biochemistry, biophysics, and microbiology programs. All of those could be fine choices if you had, say, interests in the structure and function of membrane proteins, and found schools where those graduate programs had particular strengths. (Going off the notion that photosynthesis is mediated by membrane protein complexes, that is, and you thought membrane proteins were really cool as a result.) You have to ask yourself, "What are my somewhat specific scientific interests?" and work from there. You need to start moving from "I'm interested in biochemistry, biophysics, and microbiology" to "I'm interested in membrane proteins, energy transfer mechanisms, and bioinorganic complexes." Or whatever it is that interests you. This is something you should have done already if you're applying to graduate school, to be honest, IMO.