1. In one of her first books, The Darkness at the End of the Wormhole, Rose Dark

Question

1. In one of her first books, The Darkness at the End of the Wormhole, Rose Darkly includes an alien species, the grones, that produce much less ATP per glucose than human beings do. Citric acid cycle enzymes in the grones perform all of the oxidations in the citric acid cycle using FAD (to generate FADH2) in place of NAD (to generate NADH). Did Darkly get it right? That is, would forming FADH2 at each oxidation- reduction step in the citric acid cycle rather than NADH, result in an organism that forms less ATP per glucose using the electron transport/oxidative phosphorylation system? Justify your answer.

Explanation / Answer

Yes this is true FADH2 will produce less ATP than NADH becuase FADH2 produces 1.5 ATP per FADH2 while NADH produce 2.5 ATP per NADH.It is so because during Electron transport chain NADH transport 10 hydrogen while during FADH2 complex 1 is not involved and only 6 hydrogen are transported.4 hydrogen are required for 1 ATP formation.

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