Multiple Choice
In oxidative phosphorylation, what is the final electron acceptor in the mitochondrial electron transport chain (ETC)?
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Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation
Oxidative Phosphorylation 2
Multiple Choice
In oxidative phosphorylation, what are the immediate products of the electron transport chain (ETC) before ATP synthase acts?
A
Net production of and
B
Direct synthesis of ATP from and in the mitochondrial matrix
C
Oxidation of to and production of
D
A proton gradient across the inner mitochondrial membrane and reduced oxygen as
Verified step by step guidance1
Understand that the electron transport chain (ETC) is a series of protein complexes located in the inner mitochondrial membrane that transfer electrons from electron donors like NADH and FADH2 to oxygen.
Recognize that as electrons move through the ETC, energy is released and used to pump protons (H\(\textsuperscript{+}\)) from the mitochondrial matrix into the intermembrane space, creating a proton gradient (also called the proton motive force).
Note that the immediate products of the ETC before ATP synthase acts are this proton gradient across the inner mitochondrial membrane and the reduction of oxygen to form water (H\(\textsubscript{2}\)O).
Recall that ATP synthesis from ADP and inorganic phosphate (P\(\textsubscript{i}\)) occurs later, driven by the flow of protons back into the matrix through ATP synthase, not directly by the ETC itself.
Summarize that the ETC's direct outputs are the proton gradient and reduced oxygen (water), which together enable the subsequent production of ATP during oxidative phosphorylation.
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