The energy source that makes oxidative phosphorylation possible comes from A) phosphate group transfers from ATP. B) electrons that are transferred from NADPH. C) electrons that are transferred from NADH. D) electrons that are removed from CO₂ during its oxidation.

Question

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Electrons that are transferred from NADH are the main source of energy for oxidative phosphorylation. The electrons are passed along a series of protein complexes in the electron transport chain (ETC), which generates a proton gradient across the inner mitochondrial membrane. This gradient is then used by ATP synthase to produce ATP through oxidative phosphorylation. Option A is incorrect because ATP itself is not a source of energy, but rather a molecule that carries energy. Option B is incorrect because NADPH is not directly involved in oxidative phosphorylation. Option D is incorrect because CO₂ is not a molecule involved in cellular respiration.

The Energy Source That Makes Oxidative Phosphorylation Possible Comes from