NEET Question Pattern Analysis (2015–2024)

Most Frequently Tested Topics:

1. Total ATP yield (38 or 36 per glucose): Asked in almost every alternate year. NEET expects 38 ATP as the standard theoretical maximum. The answer 36 ATP applies only when the question specifically mentions the glycerol-3-phosphate shuttle. Key trap: students choose 40 (wrong) or 36 (partially correct).

2. RQ value questions: Common question formats:

   • "The RQ of ______ is 0.7" → Answer: fats
   • "RQ = 1 when the substrate is..." → Answer: carbohydrates
   • "RQ > 1 for..." → Answer: organic acids (malic acid)
   • "Calculate the RQ of malic acid" → Must know equation and solve

3. ETS and Complex identification:

   • "$FADH_{2}$ enters the ETS at which complex?" → Complex II
   • "The final electron acceptor in ETS is..." → $O_{2}$
   • "Which complex does NOT pump protons?" → Complex II
   • "Mobile carrier between Complex III and IV is..." → Cytochrome c

4. Location of glycolysis: Consistently asked. The trap is students choosing "mitochondrial matrix." Correct answer: cytoplasm.

5. Fermentation: "Pyruvate is converted to ethanol by which organism?" → Saccharomyces. "Which enzyme catalyses pyruvate → lactate?" → Lactate dehydrogenase.

6. Amphibolic nature of TCA cycle: Definition-based + reason-based questions. Must explain OAA → aspartate and acetyl CoA → fatty acids.

7. Chemiosmosis: "Peter Mitchell's hypothesis explains..." ATP synthesis via proton gradient. "$H^{+}$ flows from ___ to ___ through ATP synthase" → Intermembrane space to matrix.

High-Yield One-Liners

• RQ = 1 → carbohydrate; RQ < 1 → fat; RQ > 1 → organic acid
• Glycolysis → cytoplasm; TCA → mitochondrial matrix; ETS → inner mitochondrial membrane
• NADH → 3 ATP; $FADH_{2}$ → 2 ATP ($FADH_{2}$ bypasses Complex I)
• Fermentation = 2 ATP; Aerobic = 38 ATP
• Peter Mitchell = chemiosmosis; Hans Krebs = TCA cycle