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Safari File Edit View History Bookmarks Window Help 74%) Sun Sep 9 14:40:25 E a blackboard.vcu.edu 7th Edition Textbook Solutions Courses-Blackboard Learn Take Test: Assignment 1: Meta... AmazonSmile: Stentor 1500 4/ Stentor 1500 4/4 Violin Review Home | Chegg.com QUESTION 2 8.33 points S Nitrate (NO03 and Nitrite (NO2) look a lot alike, and so do Sulfate (SO4 and Sulfite (SO3 Some redox potentials in the tower are pH specific, for example Iron (Fe) depends on pH Make sure you pick the one the question is asking you about. Use the equation Ecell EOreidation and the redox tower on page 82 of the textbook to solve for Ecell What is the redox potential (AE) for the oxidation of NADH paired with the reduction of FMN, part of Complex 1 of the ETC? The Eu for the FMN- FMNH2 half reaction is -0.22 Enter your answer rounded to two decimal places Do these half reactions form a spontaneous reaction? A) Yes B) No Enter A for yes or B for no Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save All Answers Save

Explanation / Answer

(1)

Electrons are carried from NADH to CoQ by the NADH-CoQ reductase complex. NAD+ is exclusively a two-electron carrier: it accepts or releases a pair of electrons at a time. In the NADH-CoQ reductase complex, electrons first flow from NADH to FMN (flavin mononucleotide), a cofactor related to FAD, and then to an iron-sulfur protein . FMN, like FAD, can accept two electrons, but does so one electron at a time.

The overall reaction catalyzed by this complex is

Each transported electron undergoes a drop in potential of 360 mV, equivalent to a G° of 16.6 kcal/mol for the two electrons transported . Much of this released energy is used to transport four protons across the inner membraneper molecule of NADH oxidized by the NADH-CoQ reductase complex, but how this protein transport occurs is not know.

(2) Ans [A]

Yes these half reactions form spontaneous reactions.

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