Multiple Choice
Which stage of aerobic glucose metabolism produces the greatest amount of ATP per molecule of glucose?
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Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation
Oxidative Phosphorylation 1
Multiple Choice
In cellular respiration and oxidative phosphorylation, what best describes NADH?
A
A membrane-bound enzyme complex that uses electron transfer to pump protons across the inner mitochondrial membrane
B
The final electron acceptor that is reduced to water at Complex IV
C
The reduced electron carrier that donates high-energy electrons to Complex I of the electron transport chain
D
A phosphorylated nucleotide that directly provides the phosphate for ATP synthesis by ATP synthase
Verified step by step guidance1
Understand the role of NADH in cellular respiration, specifically in the electron transport chain (ETC) during oxidative phosphorylation.
Recall that NADH is a reduced electron carrier molecule, meaning it carries high-energy electrons obtained from earlier metabolic processes like glycolysis and the citric acid cycle.
Identify that NADH donates these high-energy electrons to Complex I (NADH dehydrogenase) of the electron transport chain, initiating the process of electron transfer through the complexes.
Recognize that NADH itself is not an enzyme complex, nor is it the final electron acceptor; instead, it serves as an electron donor to the ETC.
Note that NADH is not directly involved in providing phosphate groups for ATP synthesis; ATP synthase uses the proton gradient generated by electron transfer, not phosphate from NADH.
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