Also, just for future reference, lets say you get a C in the Bio I and then an A in Bio II....there is no need to retake Bio I.
You prove with Bio II that you can handle...just do better on higher level courses.
Physics II, I would not worry in that case.
Ochem II - bad grade; take Biochem get an A
Gchem II - bad grade; take Ochem and do well or Biochem do well
Basically, you dont have to retake a bad prereq, only if you have alot of bad prereqs...and need to show that was not your ability and do to some other circumstance....that you will have to explain!! of course!! 🙄