If someone majored in life science what jobs would be open to them?

Answer 1

All sorts of things - a degree in anything doesn't particularly restrict you.

The obvious things:

Teaching
Scientific research in academia
Industrial research e.g. in pharmaceutical companies
Patents
Scientific publishing
etc.

However, I have friends with bioscience degrees who are now lawyers, doctors, computer programmers, system administrators, artists, administrators, general managers, marketers etc etc.