In aerobic respiration, NADH is oxidized at complex I, while FADH₂ is oxidized at complex II.
The final stage of aerobic respiration and the sole stage of glucose metabolism to utilize ambient oxygen is the electron transport chain. The electron transport chain is made up of the aggregation of the four protein complexes, designated I through IV, and their associated mobile, accessory electron carriers. Both the plasma membrane of prokaryotes and the inner mitochondrial membrane of eukaryotes include several copies of the electron transport chain.
Complex I:
Two electrons are initially delivered by NADH to the first complex. A protein comprising iron-sulfur (Fe-S) and flavin mononucleotide (FMN) make up this complex I.
Complex II:
FADH2 enters complex II directly; complex I is not involved. Ubiquinone (Q) is the substance that joins the first and second complexes to the third.
Complex III:
The Rieske center (2Fe-2S center), cytochrome b, another Fe-S protein, and cytochrome c proteins make up the third complex, commonly known as cytochrome oxidoreductase.
Complex IV:
Cytochrome proteins c, a, and a3 make up the fourth complex. Three copper ions and two heme groups make up this combination.
I understand the question you are looking for is this:
In aerobic respiration, NADH is oxidized at ____________, while FADH₂ is oxidized at ____________.
A. Complex I; Complex II
B. Photosystem I; Photosystem II
C. Photosystem II; Photosystem I
D. Complex I; Complex I
E. Complex II; Complex III
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