This may be a university to university and course to course difference too. My intro 3000 level biochem class didn’t have us memorize structures but my 5000 structural biochem class did and certain nucleic acid structures and stuff. Can’t remember shit now but I definitely had to memorize them at some point in undergrad.
Sorry, just meant that for biochemistry it was the “lowest level” you could take. It was usually a 3rd or 4th year class. Anything 4000+ level for us was a graduate school level class. I was just saying I had the same experience as you to some degree but it’s possible different schools/professors have different expectations.