The correct sequence of electron acceptor in ATP synthesis is

1. A) c, b, a, a₃
2. B) b, c, a₃, a
3. C) b, c, a, a₃
4. D) a, a, b, c

Answer:C) Cyt.b, c, a, a₃

Explanation: ATP is synthesised by oxidative phosphorylation in the electron transport chain. Electrons from NADH and FADH2 are carried by various electron acceptors. When NADH is oxidised by complex I (NADH dehydrogenase), electrons are transferred to ubiquinone and reduce to ubiquinol. From ubiquinol, electrons are transferred to Cyt c through cytochrome bc1 (complex III) and then from Cyt c, which is a mobile electron acceptor, electrons get transferred to cytochrome c oxidase (complex IV), which contains Cyt a and a₃ and then to oxygen molecule. Oxygen acts as a terminal electron acceptor. So the correct order of electron acceptor in ATP synthesis is Cyt. b, c, a, a₃.

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