A lot of schools have a 6 year program, where you can do 2 years of pre-pharmacy coursework, and as long as you maintain a certain GPA, you are pretty much guaranteed to get into that school's pharmacy school. However, you can only do this straight out of high school. It is not absolutely necessary to get a degree before going to pharmacy school. But if you did want one, it doesn't really matter if you pick bio or biochem, pick whichever interests you more.