The podcast walks through glycolysis in detail—its ten enzymatic steps, key intermediates, and critical regulatory points like phosphofructokinase, controlled by allosteric effectors including ATP, citrate, and fructose-2,6-bisphosphate. It then transitions to mitochondrial metabolism: pyruvate’s conversion to acetyl-CoA, followed by the Krebs cycle’s eight-step oxidation process, highlighting enzyme roles, energy carriers (NADH, FADH₂, GTP), and regulation by calcium and energy status. The electron transport chain is explained as a redox relay across five complexes, emphasizing proton pumping by Complexes I, III, and IV to build the electrochemical gradient that drives ATP synthase. The episode underscores how these pathways interconnect quantitatively—linking substrate-level phosphorylation to oxidative phosphorylation—and reinforces that mastering regulation logic—not just memorization—is essential for MCAT success.