Waec Model Questions Vol1 2022 Biology Question 5

During strenuous activity a muscle cell performs anaerobic glycolysis followed by lactic‑acid fermentation. In this pathway each glucose yields 2 ATP from glycolysis, and the conversion of pyruvate to lactate re‑oxidises the 2 NADH produced, which would otherwise generate 3 ATP each via oxidative phosphorylation. If aerobic oxidation of one glucose yields 30 ATP, (a) what is the net loss of ATP per glucose when the cell uses anaerobic fermentation instead of aerobic respiration? (b) If the cell consumes 5 × 10⁶ glucose molecules per minute under anaerobic conditions, calculate the total ATP produced per minute and the difference compared with the theoretical aerobic ATP production for the same glucose amount. Express the difference in ATP molecules per minute.