Animal testing is all over biochemistry and biology, is not just used for pharmaceutical and cosmetics testing. Many ground braking discoveries have been (and are still being made) via animal testing. There are whole subdisciplines that are based around animal testing like developmental or behavioural biology.

Though you can avoid it if you really want to, if you study biochemistry, you will learn how to do animal testing and are taught about all the ethics involved, how to do the testing in the most humane way, and how to avoid (or minimize) doing it in the first place if possible.

I've been going through the list of recent Nobel Prizes and the research for these involved animal testing: Nobel Prize for medicine 2018 (mice), 2017 (flys), 2014 (rats), 2012 (frogs, mice). Older research made before we had good tools to work with cell cultures, etc. will probably skew even more towards animal testing.