I was wondering if topology has ever been utilized on the structure of DNA and how that applies to its functions? I am assuming that it has as this is one of the most obsessed over molecules in the 21st century. I am interested in this area of topology if it exists. Also I have no previous knowledge of the field of topology, and was wondering if I wanted to take this field up as a hobby, what would I have to study before hand? As in, which particular maths would make my life easier. I have currently only studied Calculus, single variables about three years ago. I am a Molecular Biology student, so haven't touched any other math. Thanks for any help in either questions.