Multiple Choice
In oxidative phosphorylation, what is the primary purpose of NADH and FADH2?
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Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation
Oxidative Phosphorylation 1
Multiple Choice
In oxidative phosphorylation, which compound directly receives electrons from NADH at the start of the electron transport chain?
A
Cytochrome c
B
Complex II (succinate dehydrogenase)
C
Complex IV (cytochrome c oxidase)
D
Complex I (NADH dehydrogenase)
Verified step by step guidance1
Understand that oxidative phosphorylation involves the electron transport chain (ETC), where electrons are transferred through a series of protein complexes embedded in the inner mitochondrial membrane.
Recall that NADH is a key electron donor in the ETC, and it donates electrons at the very beginning of the chain.
Identify the specific complex that accepts electrons directly from NADH. This complex is known as Complex I, also called NADH dehydrogenase.
Note that Complex I transfers electrons from NADH to ubiquinone (coenzyme Q), initiating the electron flow through the ETC.
Recognize that other complexes, such as Complex II (succinate dehydrogenase), Complex III, and Complex IV, receive electrons later in the chain, not directly from NADH.
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