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 In the electron transport system, a molecule of ATP is formed when an electron passes from:
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The correct answer is:
Cytochrome-b to cytochrome-c1 
 In all, 3 ATP molecules are formed in the electron transfer system:
i. First between NADH2 and FMN.
ii. Second between cytochrome-b and cytochrome-c1
iii. Third between cytochrome-a and cytochrome-a3

 i. First between NADH2 and FMN.
ii. Second between cytochrome-b and cytochrome-c1
iii. Third between cytochrome-a and cytochrome-a3

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