what take precedent over SN2 or E2? also, which moves faster in electrophoresis, protein with a higher molecular weight or with a lower MW? according to destroyer it says that protein with the higher MW moves faster so i am not sure. this just does not make sense! if it talks about comparing the polarity then i understand that the polar molecule moves slower b/c of the polarity. the agar gel is polar so polar molecule with stick it. but what about size?