Question

Which one of the following is the terminal electron acceptor?

• A. Molecular $CO_{2}$
• B. Molecular $O_{2}$
• C. Molecular $H_{2}$
• D. $NADPH_{2}$

Answer 1

Answer: (B)

In electron transport chain, cytochrome $a_{3}$ is an electron carrier, which contains copper with iron. It picks up electrons and through copper, it hands over the electrons to oxygen. Therefore, oxygen accepts the terminal electrons.