I hope you are doing well! Typically, we recommend that you take 2-3 (max.) STEM classes per semester. However, I have taken both MCDB 310 and BIOLOGY 305 (not in the same semester) and they are some pretty tough courses, with both having a heavy workload and being relatively difficult courses. So, I don’t know if I would recommend taking both together. MCDB 310 will have you memorizing hundreds of detailed slides for each exam and BIOLOGY 305 is just a more conceptually difficult course that requires tons of practice. So, to me, it doesn’t seem like the best choice. Especially since biochem is such an important topic for the MCAT, I would recommend taking that course at a time where you can effectively learn/memorize the information so that you won’t have to re-do all the heavy work when studying for the MCAT.
Though, I do know some people who have taken this combination, and while they said it was quite difficult, they still were able to be successful in both of these courses. You would just have to make sure that you are always on top of things as falling behind can be a slippery slope. If you were to take these both, I would then recommend taking a low credit load (~14ish credits) and make sure that your other courses have an extremely light workload.
Ultimately, I would look at how much time you will have in the fall (classes, extracurriculars, time to relax and hang out with friends) and think about whether you could handle this workload. Another thing I might recommend is registering for both and feel out how everything is going during the first couple of weeks, and then decide if you want to continue with this schedule or maybe drop one.
I hope this helps! Feel free to follow up on this Q&A post or make another post if you have any further questions!
Raheem, PMH Co-President