<p>I know quite a few chemistry profs at an assortment of schools and have frequently heard comments along the
lines that they see it as their responsibility to weed out applicants for med school. They really think the med school expect and want this. And I heard a biology prof (not a UChicago prof) just last night make a similar remark. The attitude is in the culture of those fields and it probably does exist at UChicago–along with most of the other universities in the US. </p>