Multiple Choice
In oxidative phosphorylation, what is the primary role of NADH?
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Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation
Oxidative Phosphorylation 1
Multiple Choice
In oxidative phosphorylation, what is FADH2?
A
A reduced electron carrier formed when FAD accepts two electrons and two protons, donating electrons to the electron transport chain at Complex II (succinate dehydrogenase)
B
A high-energy phosphate compound that directly phosphorylates ADP to form ATP in the citric acid cycle
C
The oxidized form of flavin adenine dinucleotide that directly donates electrons to Complex I
D
A mitochondrial membrane protein that functions as the primary proton pump of the electron transport chain
Verified step by step guidance1
Understand the role of FADH2 in cellular respiration, specifically in oxidative phosphorylation, where it acts as an electron carrier.
Recall that FAD (flavin adenine dinucleotide) is a coenzyme that can accept electrons and protons, becoming reduced to FADH2.
Recognize that FADH2 donates electrons to the electron transport chain, but unlike NADH, it donates electrons at Complex II (succinate dehydrogenase), not Complex I.
Note that FADH2 is not a high-energy phosphate compound and does not directly phosphorylate ADP to ATP; that role belongs to other molecules like GTP or ATP itself.
Confirm that FADH2 is not a mitochondrial membrane protein or a proton pump; instead, it is a reduced electron carrier formed when FAD accepts two electrons and two protons.
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