CELL RESPIRATION
OXIDATIVE PHOSPHORYLATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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1.5
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2.5
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Detailed explanation-1: -The oxidation of one molecule of NADH thus leads to the synthesis of three molecules of ATP, whereas the oxidation of FADH2, which enters the electron transport chain at complex II, yields only two ATP molecules.
Detailed explanation-2: -NADH enters the ETC at complex I and produces a total of 10 H+ ions through the ETC (4 from complex I, 4 from complex III, and 2 from complex IV). ATP-synthase synthesizes 1 ATP for 4 H+ ions. Therefore, 1 NADH = 10 H+, and 10/4 H+ per ATP = 2.5 ATP per NADH (**some sources round up**).
Detailed explanation-3: -One NADH molecule produces 3 ATP molecules. Whereas one FADH2 molecule produces 2 ATP molecules.
Detailed explanation-4: -Assertion :Oxidation of one molecule of NADH gives rise to 3 molecules of ATP and that of one molecule of FADH2 produces 2 molecules of ATP. Reason: The number of ATP molecules synthesised depends on the nature of the electron donor.
Detailed explanation-5: -One NADH molecule is equivalent to three ATP molecules inside the mitochondria.