Eh Solvents. Haha. Not something I am completely familiar with since my instructors did not emphasize it but from what I remember: Polar protic because the polar molecule can stabilize the ions(particularly the carbocation) and it being protic increases stability of the leaving group anion. On the other hand polar protic solvents would get in the way of nucleophiles in Sn2 since most nucleophiles are at least somewhat basic. Since Sn2 is a biomolecular reaction if you weaken the nucleophile you slow the reaction? Hopefully that makes some sense!
I am only familiar with immunology because it beat me up twice. Yes my lowest Bio grades are in the 2 classes that directly relate to my major
Anyways if you have a chance to take immunology or learn some of it do it! Because immunology has a little bit of everything in it...from developmental to biochem/chemistry and its interesting to see how the molecular mechanisms make a difference at the physiological level. ie: anaphylactic shock....
yea I still need to cover/review a few gapping holes in my knowledge. Most notably: Optics, Thermochemistry, Titrations, and Hormones.
I actually think my gaping holes outweigh my knowledgeable areas... I think my most noticeable ones are Gases (chemistry-wise), Optics, Microbiology, Eukaryotes vs. Prokaryotes, Ridiculously Basic Cell Biology, Solution Equilibria, Aldols, and Immunology. And that's just getting started!