Error Analysis — NEET Traps in Respiration — Notes | NoteTube

#	Common Trap	Incorrect Belief	Correct Fact
1	Location of glycolysis	Students place glycolysis in the mitochondria (because respiration = mitochondria)	Glycolysis occurs in the CYTOPLASM; it predates mitochondrial evolution
2	ATP yield — 36 vs 38	Either 36 or 38 is accepted in all contexts	NEET standard = 38 ATP; 36 only when glycerol-3-P shuttle is specifically mentioned
3	$FADH_{2}$ enters at Complex I	Students think all coenzymes enter at the same complex	$FADH_{2}$ enters at Complex II; NADH enters at Complex I → $FADH_{2}$ yields 2, NADH yields 3 ATP
4	RQ of fats = 1.0	Assuming all substrates give RQ = 1.0 like carbohydrates	Fat RQ ≈ 0.7 (more $O_{2}$ needed); organic acids > 1.0; CAM plants at night = ∞
5	Fermentation is aerobic	The word "fermentation" sounds industrial/vigorous	Fermentation is ANAEROBIC (no $O_{2}$ ); only 2 ATP per glucose
6	Pyruvate decarboxylase vs Pyruvate dehydrogenase	The two enzymes are confused	Pyruvate DECARBOXYLASE: fermentation (pyruvate → acetaldehyde). Pyruvate DEHYDROGENASE complex: link reaction (pyruvate → acetyl CoA)
7	TCA produces 3 NADH per turn	Forgetting to count the malate → OAA step	TCA: 3 NADH per turn; the third comes from malate dehydrogenase (malate → OAA)
8	$O_{2}$ is used in all ETS complexes	$O_{2}$ must be involved everywhere there is oxidation	$O_{2}$ is ONLY used at Complex IV (cytochrome c oxidase); Complexes I, II, III do not directly use $O_{2}$
9	Amphibolic means it has no function	Students confuse amphibolic with ambiguous	Amphibolic = BOTH catabolic AND anabolic; TCA cycle is the classic example
10	GTP ≠ ATP	Students discount GTP from TCA cycle in ATP count	GTP = energetic equivalent of ATP; 2 GTP from TCA = 2 ATP equivalents in the final count