That single petri dish question is the academic equivalent of saying "Don't worry, this won't hurt a bit" before performing full-body surgery without anesthesia. Sure, you've got 6 hours, open books, open notes, and the entire internet—because you'll need the collective knowledge of humanity to figure out why your bacteria colony looks like your professor's ex-wife's signature. The real test isn't answering the question; it's maintaining your sanity while staring at a red circle of doom that somehow determines your entire future.