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Grade: 11

                        

Which of these is the final electron acceptor in the electron transport chain? A F A D H 2 ​ . B N A D H . C Cytochrome C. D Water. E Oxygen.

one month ago

Answers : (1)

Adarsh Pal
askIITians Faculty
159 Points
							

 The correct answer is oxygen.

Electron transport chain or respiratory chain is present in the inner membrane of the mitochondrion. It is formed of different enzymes and co-enzymes which act as hydrogen and electron carriers. These electron carriers are arranged according to their increasing positive potential. 
Hydrogen from NADH is first transferred to Co-Q via FMN (flavin mononucleotide). Co-Q liberates protons and electrons. Only electrons are transferred through ETS and protons (H+) are released into the surrounding medium. The electron than passes to cytochrome-b from Co-Q and further transferred to cytochrome-c1 and then to cytochrome-c. From cytochrome-c electrons are transferred to cytochrome-a and then to cytochrome-a3 which finally donates the electrons to free molecular oxygen. Thus oxygen acts as the last electron acceptor at the end of respiratory chain.
one month ago
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