Question

The terminal electron acceptor during the electron transport chain is .

• A. NADH
• B. $O_2$
• C. $C{O}_2$
• D. $FAD{H}_2$

Answer 1

The correct option is B $O_2$

The last $e^{-}$ acceptor in the ETC of aerobic respiration is $O_2$. This is what makes oxygen an essential aspect of aerobic respiration, without oxygen the complex IV of ETC will not have any electron acceptor to which it can transfer the low energy electrons, thus the complex cannot be reoxidized for another cycle and this will eventually block the ETC.