Sapling Learning macrmilian learning Determine which complex of the electron tra

Question

Sapling Learning macrmilian learning Determine which complex of the electron transport chain (respiratory chain) each phrase describes. Note: If you answer this question a single red X will appear indicating that one or more of the phrases are incorrectly. incorrectly, Complex I Complex II Complex III Complex IV electron transfer cytochrome oxidase electron transfer cytochrome bc1 complex (CoQ-cytochrome creductase) from cytochrome c to O2 from NADH to ubiquinone (coenzyme Q) Telectron transfer from ubiquino succinate dehydrogenase (QH2, or reduced CoQ) to cytochrome c electron transfer from succinate to ubiquinone (coen NADH dehydrogenase complex

Explanation / Answer

Complex I :- electron transfer from NADH to ubiquinone (coenzyme Q) and NADH dehydrogenase complex.

because this large protein complex transfers 2 electrons from NADH to coenzyme Q. Complex I was formerly known as NADH dehydrogenase. Complex I accepts electrons from NADH and serves as the link between glycolysis, the citric acid cycle, fatty acid oxidation and the electron transport chain.

Complex II :- electron transfer from succinate to ubiquinone (coenzyme Q) and succinate dehydrogenase complex.

Complex II includes succinate dehydrogenase and serves as a direct link between the citric acid cycle and the electron transport chain.The only enzyme of the citric acid cycle that is an integral membrane protein. This complex is composed of four subunits.

Complex III :- This complex is also known as cytochrome bc1 complex (CoQ-cytochrome c reductase) and electron transfer from cytochrome c to O2

because it passes the electrons form CoQH2 to cyt c through a very unique electron transport pathway called the Q-cycle

Complex IV :- is also known as cytochrome oxidase and electron transfer from ubiquinol (QH2 or reduced CoQ) to cytochrome c

because it accepts the electrons from cytochrome c and directs them towards the four electron reduction of O2 to form 2 molecules of H2O.

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