Advice needed for IT Grad wanting to study an entirely different field

My question is if someone graduated with a degree in one field and has a greater passion to pursue and research something totally left field from their degree, what are their first steps? I'd like to contribute meaningful research in Biology, but I'm essentially a freshman. Should I restart at a community college? What would grad programs/professors say to me?

The question can be broadened to what if an Art grad wanted to study Statistics? Health Sciences to Aerospace Enginnering, Nursing to Music, Economics to Chemistry, etc...