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Flow of electrons in ETS is NADH + H^+ (...

Flow of electrons in ETS is `NADH + H^+ (NADPH +H^+) to FMN FeS" protein "CoQto cytb toc_1tocytctocya atocyaa_3too''`.At three steps ATP is formed (oxidative phosphorylation). Where does II ATP is formed?

A

Between `NADH_2` and FMN

B

`Cyt b and Cyt c_1`

C

`Cyt a and Cyt a_3`

D

`FMN to FeS` protein

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To determine where the second ATP is formed in the electron transport system (ETS), we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Electron Transport System (ETS)**: - The ETS is a series of protein complexes and electron carriers located in the inner mitochondrial membrane. It facilitates the transfer of electrons derived from NADH and FADH2 to oxygen, ultimately leading to ATP production through oxidative phosphorylation. 2. **Identifying the Flow of Electrons**: - The flow of electrons in the ETS starts from NADH and H^+, which donates electrons to FMN (Flavin Mononucleotide), followed by a series of transfers through FeS proteins, CoQ (Coenzyme Q), cytochrome b, cytochrome c1, cytochrome a, and cytochrome a3, before finally reducing oxygen. 3. **ATP Formation in ETS**: - ATP is generated at specific points in the ETS through a process called oxidative phosphorylation, which is driven by the proton gradient created by the electron transport. 4. **Locating the Second ATP Formation**: - According to the flow of electrons: - The first ATP is formed between FMN and CoQ. - The second ATP is formed between cytochrome b and cytochrome c1. - The third ATP is formed between cytochrome a and cytochrome a3. 5. **Conclusion**: - Therefore, the second ATP is formed at the step where cytochrome b transfers electrons to cytochrome c1. ### Final Answer: The second ATP is formed between cytochrome b and cytochrome c1. ---
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