<p>I would imagine it varies depending on the school. But at my school, it would be gen chem, cell bio, systems physiology, and possibly orgo 2 (I haven't taken it yet).</p>
<p>At my school gen chem is considered a weeder, ie I hear most people talking about how hard gen chem is...not so much orgo. Orgo seems to be the universal weeder class. Bio and physics aren't exactly cakewalks either.</p>
<p>Like phonyreal said, orgo tends to be the "universal" weedout class.</p>
<p>Gen chem is a pretty big one (at least at my school); I know more people who decided against the pre-med route after general chem than after orgo (possibly because GChem culled the herd and there was a higher proportion of people who could cut it by the time OChem rolled around).</p>
<p>why do we hear about chemistry as a weed out more often than for biology or physics? </p>
<p>I would almost expect biology to be more specific to premeds since the subject deals directly with living things, including chemical factors and so why isn't bio as much a weed out course? Furthermore, is physics actually easier than chemistry somehow? I have not heard that it is-- in fact at my school, AP physics is much more difficult than AP chemistry so I'm confused... </p>
<p>Is a course gain reputation as a "weed out" course more from the professors intentionally trying to find the best students or more from the difficulty of the subject itself?</p>
<p>There is no "weed out" conspiracy. The hard fact is, most people are not competent for for a science career, others are competent but aren't willing to put the work in.</p>
<p>"Weeding out" only eliminates those who are not fit to begin with.</p>
<p>Logically, there is no incentive for programs to weed out- not only premeds take those courses, departments get more funding/attention/power the more students they have, etc.</p>
<p>Science is a hard subject, there will not be many people who cannot make it past the first stage. If these classes are truly weeder classes, there will be a significant amount of people who do worse in the beginning (after adjusting for freshman adaptation).</p>