I hear ya, I'm in a similar but opposite boat, my first degree was also bio and I did poorly about a decade ago. For what it's worth the WCU program director told me science GPA is only calculated by...
I do have many years of volunteer work as a camp counselor for kids with cancer, I was planning to speak on it during an interview, but I guess in hindsight I should have included it on my resume, but...
So far I haven't heard anything, but considering what everyone else is saying, I suspect no interview for me, I did poorly on the GRE with not enough time to retake it, but I will retake it this year...