Electron transport chain (ETC) is a set of ______ electron carriers present in a specific sequence along _______ mitochondrial membrane. A seven, inner B six,inner C seven,outer D six,outer

The correct answer is:

B. six, inner

Explanation:

The electron transport chain (ETC) consists of a series of six major electron carriers, including protein complexes and mobile carriers such as NADH dehydrogenase, cytochrome c reductase, and cytochrome c oxidase. These carriers are located in the inner mitochondrial membrane, where they transfer electrons and help establish a proton gradient for ATP synthesis.