if at the end of the day your gpa is still unimpressive then no one on the admissions comittee is going to sift through your transcript to notice that during one semester you took one extra course, especially a first year arts course. They don't have the time, they probably don't really care, and it's not all that impressive IMHO.
And if you really hate biology so much, why are you even intereted in this profession? You do realize that you will have to study MUCH more bio than you did in two or three courses in the first year of university....