Transfer to a Biological Sciences major

I am an admitted student to UCSD under the major of Pharmaceutical Chemistry and then I used the change your major tool online to switch into Biochemistry/Chem. However, I heard that there is some physics classes which you have to take in that major, and I would prefer not to take physics again. I assumed that bio majors take less physics classes than chem majors? So I was wondering how difficult it is to transfer into a biological science major and if there is a lot of prerequisites to transfer into one.