MCAT Metabolism: Glycolysis, Steps, Enzymes & Regulation

In this week’s Jack Westin MCAT Podcast, Mike and Molly pull glycolysis out of the rote-memorization zone and rebuild it as a story you can see, explain—and defend—on test day. Starting with the big-picture difference between aerobic and anaerobic metabolism, they zoom into the 10 classic steps, spotlight why hexokinase and especially PFK-1 are the pathway’s “no-turning-back” moments, and finish with the hormonal signals that flip glycolysis on or off in real life. Along the way they debunk lactic-acid myths, link fasting physiology to MCAT passages, and hand you regulation mnemonics that actually stick.Key takeaways at a glance- Net yield, location & oxygen: Cytoplasmic pathway that nets 2 ATP, 2 NADH, 2 pyruvate—no O₂ required.- Energy investment vs. payoff: Why you spend 2 ATP up front and gain 4 later (+2 net).- Regulation checkpoints: Steps 1, 3 & 10 are irreversible; PFK-1 is the commitment step; ATP inhibits, ADP/AMP activate.- Hormonal control: Insulin (via PFK-2) ramps glycolysis up; glucagon turns it down—crucial in fed vs. fasting states.- Clinical & exam links: Cori cycle, muscle soreness myth, and how enzymes like hexokinase signal MCAT question writers.Next episode: PDH complex, electron-transport chain, and oxidative phosphorylation—subscribe so you’re ready for the hand-off from glycolysis to ATP powerhouse.Want to learn more? Shoot us a text at 415-855-4435 or email us at [email protected]! 📱📚 Free Resources: https://jackwestin.com 🎓 Live Education Sessions: https://jackwestin.com/sessions 👨🏻‍🏫 Courses: https://jackwestin.com/courses 🙋 Tutoring: https://jackwestin.com/services/live-online-mcat-tutoring📸 Follow Us On Instagram: https://www.instagram.com/jackwestinmcat👥 Join our Facebook Study Group: https://www.facebook.com/groups/freemcatprep