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Cytochromes are iron-heme proteins in which a porphyrin ring is coordinated through its central nitrogens to an iron atom that can undergo a one- electron oxidation-reduction reaction. Cytochrome f is an example of this class of molecules, and it operates as a redox agent in chloroplast photosynthesis. The standard reduction potential E' of cytochrome fat pH 7 can be determined by coupling it to an agent of known , such as ferricyanide/ferrocyanide: Fe(CN)+ e → Fe(CN) €° = +0.440 V 6 In a typical experiment, carried out spectrophotometrically, a solution at 25°C and pH 7 containing a ratio [Fe(CN) ]/[Fe(CN)³] = 2 is found to have a ratio [Cyt fred]/[Cyt fox] = 0.10 at equilibrium.

Cytochromes are iron-heme proteins in which a porphyrin ring is coordinated through its central nitrogens to an iron atom that can undergo a one- electron oxidation-reduction reaction. Cytochrome f is an example of this class of molecules, and it operates as a redox agent in chloroplast photosynthesis. The standard reduction potential E' of cytochrome fat pH 7 can be determined by coupling it to an agent of known , such as ferricyanide/ferrocyanide: Fe(CN)+ e → Fe(CN) €° = +0.440 V 6 In a typical experiment, carried out spectrophotometrically, a solution at 25°C and pH 7 containing a ratio [Fe(CN) ]/[Fe(CN)³] = 2 is found to have a ratio [Cyt fred]/[Cyt fox] = 0.10 at equilibrium.

Chemistry
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Part A answer is not 0.363 and it's not 0.499.

 

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Exercise 7.5 Cytochromes are iron-heme proteins in which a porphyrin ring is coordinated through its central nitrogens to an iron atom that can undergo one- electron oxidation-reduction reaction. Cytochrome f is an example of this class of molecules, and it e an examp operates as a redox agent in chloroplast photosynthesis. The standard reduction potential gol of c of cytochrome f at pH 7 can be determined by coupling it to an agent of known €°, such as ferricyanide/ferrocyanide: Fe(CN) 3 + e → Fe(CN) 4 = +0.440 V € In a typical experiment, carried out spectrophotometrically, a solution at 25°C and pH 7 containing a ratio [Fe(CN) ]/[Fe(CN)³] = 2 is found to have a ratio [Cyt fred]/[Cyt fox] = 0.10 at equilibrium. Part A Calculate & (reduction) for cytochrome f. Express your answer to three significant figures and include the appropriate units. Submit yes 0.499 Ono μA Incorrect; Try Again; 4 attempts remaining Submit My Answers Give Up Part B On the basis of the standard reduction potential for the reduction of O₂ to H₂O at pH 7 and 25°C, is oxidized cytochrome ƒ a good enough oxidant to cause the formation of O2 to H₂O at pH 7? ? My Answers Give Up
Transcribed Image Text:Exercise 7.5 Cytochromes are iron-heme proteins in which a porphyrin ring is coordinated through its central nitrogens to an iron atom that can undergo one- electron oxidation-reduction reaction. Cytochrome f is an example of this class of molecules, and it e an examp operates as a redox agent in chloroplast photosynthesis. The standard reduction potential gol of c of cytochrome f at pH 7 can be determined by coupling it to an agent of known €°, such as ferricyanide/ferrocyanide: Fe(CN) 3 + e → Fe(CN) 4 = +0.440 V € In a typical experiment, carried out spectrophotometrically, a solution at 25°C and pH 7 containing a ratio [Fe(CN) ]/[Fe(CN)³] = 2 is found to have a ratio [Cyt fred]/[Cyt fox] = 0.10 at equilibrium. Part A Calculate & (reduction) for cytochrome f. Express your answer to three significant figures and include the appropriate units. Submit yes 0.499 Ono μA Incorrect; Try Again; 4 attempts remaining Submit My Answers Give Up Part B On the basis of the standard reduction potential for the reduction of O₂ to H₂O at pH 7 and 25°C, is oxidized cytochrome ƒ a good enough oxidant to cause the formation of O2 to H₂O at pH 7? ? My Answers Give Up
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