In the electron transport system present in the inner...

In the electron transport system present in the inner mitochondrial membrane, complexes I and IV are respectively (a) NADH dehydrogenase and $\mathrm{FADH}_{2}$ (b) $\mathrm{FADH}_{2}$ and NADH dehydrogenase (c) NADH dehydrogenase and cytochrome oxidase complex (d) NADH dehydrogenase and ATP synthase.

In the electron transport system present in the inner mitochondrial membrane, complexes I and IV are respectively
(a) NADH dehydrogenase and $\mathrm{FADH}_{2}$
(b) $\mathrm{FADH}_{2}$ and NADH dehydrogenase
(c) NADH dehydrogenase and cytochrome oxidase complex
(d) NADH dehydrogenase and ATP synthase.

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Key Concepts

Complex IV (Cytochrome Oxidase)

Complex IV, known as cytochrome oxidase, is the terminal enzyme of the mitochondrial electron transport chain. It facilitates the final transfer of electrons to molecular oxygen, reducing it to water. This complex also contributes to the proton gradient by pumping protons across the inner mitochondrial membrane, which ultimately drives ATP synthesis.

Complex I (NADH Dehydrogenase)

Complex I, also known as NADH dehydrogenase, is the first enzyme of the mitochondrial electron transport chain. It catalyzes the transfer of electrons from NADH to ubiquinone (coenzyme Q), while simultaneously pumping protons across the inner mitochondrial membrane to contribute to the electrochemical gradient needed for ATP synthesis.

Mitochondrial Electron Transport Chain

The mitochondrial electron transport chain (ETC) is a series of protein complexes and small molecules embedded in the inner mitochondrial membrane that drive the production of ATP through oxidative phosphorylation. It plays a crucial role in cellular respiration by transferring electrons from electron donors like NADH and FADH2 to oxygen, initiating a proton gradient that is used to generate ATP.

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