The reality is that everything is fair game, although it may be unlikely, it is possible (probably one of the harder questions to separate the 20s from the high 20s). I had a question on the DAT that was very specific related to plants but luckily I knew the answer. the plant question was a comparative anatomical type question. I know there is so much bio that is possible to see on the exam but the more you understand and know the better off you are, anything can come up. Good luck.