Question

Last $e^{-}$ acceptor during ETS is

• A. $O_2$
• B. cyt $a$
• C. cyt $a_2$
• D. cyt $a_3$

Answer 1

The correct option is A $O_2$

In electron transport chain, there are 7 electron acceptors, which are as follows $Co-Q\to Cytb\to Cyt{c}_1\to Cytc\to Cyta\to Cyt{a}_3\to O_2$. Oxygen is the ultimate electron acceptor. These electron acceptors are present in a specific sequence along inner mitochondrial membrane.