Hi, you definitely can not get a job as either a physician assistant or nurse practitioner after a 4 year science college degree. However, this may qualify you to take a few more years of training to become one or the other of these. In general physician assistants have better training and do more than nurse practioners since the PA works under the supervision of a licensed physician. The NP seems to be less trained and educated but does have a license to practice independently but has a limited license. You should study both professions carefully and meet with at least one of these types on the job to hear what each of them has to say about their chosen profession.