<p>Remember too that many of the science professors at research universities, where they have their own graduate students, hate pre-meds (or at least they did back in the day). Chemistry professors, for example, are interested in chemistry for its own sake. They have a dozen graduate students equally interested in chemistry. They don't want to bother with kids who look at chemistry merely as a means to the end of getting into medical school, not of studying and researching in chemistry. (That's another reason why many of them hate teaching the intro courses. They want to teach budding chemists, not budding physicians.) And of course that applies to the other science professors as well.</p>
<p>Just because they're doing research doesn't mean that the opportunity for undergraduates is there.</p>