Question

Electron transport chain is located in

• A. Inner membrane of mitochondria
• B. Outer membrane of mitochondria
• C. Intermembrane space of mitochondria
• D. Matrix of mitochondria

Answer 1

The correct option is A Inner membrane of mitochondria

The electron transport chain is composed of three main membrane-associated electron carriers flavoproteins (FMN, FAD), cytochromes, and quinones (coenzyme Q or ubiquinone). All these electron carriers reside within the inner membrane of the mitochondria and operate together to transfer electrons from donors, like NADH and FADH${}_2$, to acceptors, such as O${}_2$.

Thus, the correct answer is option A.