CELL RESPIRATION
OXIDATIVE PHOSPHORYLATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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1 NADH = 1 ATP; 1 FADH2 = 1 ATP
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1 NADH = 2 ATP; 1 FADH2 = 1 ATP
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1 NADH = 3 ATP; 1 FADH2 = 2 ATP
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1 NADH = 2 ATP; 1 FADH2 = 3 ATP
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Detailed explanation-1: -The process of forming ATP from the electron transport chain is known as oxidative phosphorylation. Electrons carried by NADH + H+ and FADH2 are transferred to oxygen via a series of electron carriers, and ATPs are formed. Three ATPs are formed from each NADH + H+, and two ATPs are formed for each FADH2 in eukaryotes.
Detailed explanation-2: -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-3: -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-4: -During glycolysis, glucose ultimately breaks down into pyruvate and energy; a total of 2 ATP is derived in the process (Glucose + 2 NAD+ + 2 ADP + 2 Pi–> 2 Pyruvate + 2 NADH + 2 H+ + 2 ATP + 2 H2O).
Detailed explanation-5: -FADH2 produces less ATP then NADH because the electrons for FADH2 are dropped off at the second protein of the electron transport chain.