Question

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

Answer 1

Answer: (A)

In electron transport chain, there are $7$ electron acceptors, which are as follows $Co-Q\to Cyt$ $b\to Cyt$ $c_1\to Cyt$ $c\to Cyt$ $a\to Cyt$ $a_3\to O_2$. Oxygen is the ultimate electron acceptor. These electron acceptors are present in a specific sequence along inner mitochondrial membrane.