I just took the PCAT in July and I'm almost positive they won't. Before I took the PCAT I also tried finding a straight answer to this question, but I never found a direct answer.. But I will tell you this: for biology and chem sections, I guessed on the experimental questions and still managed to get a 99 and 95 in bio and chem, respectively. Hopefully it will stay the same for the September PCAT!