Verbal on the DAT is over sciences based text and there are only three sections where on the MCAT the material can be over anything and there are many more passages that you must complete in the give time (five or six I think, but I am not sure)
Undergrad classes that were helpful: Bio, genetics, G-chem, and O-chem, but all of the material has to be fresh in your mind for the undergrad classes to be helpful for the DAT.