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Which of the following substances will be reduced first? A. Fe3+ B. CoQ C. cytochrome c D. FMN

Which of the following substances will be reduced first? A. Fe3+ B. CoQ C. cytochrome c D. FMN

Chemistry
Chemistry
10th Edition
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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Which of the following substances will be reduced first?

A. Fe3+

B. CoQ

C. cytochrome c

D. FMN

TABLE 20.1 Standard Reduction Potentials for Several Biological Reduction Half Reactions Reduction Half Reaction O₂ + 2H* + 2€ → H₂O Fe³+ + →Fe²+ Cytochrome ₂ (Fe³+) + →Cytochrome (Fe²+) Cytochrome a(Fe³+) + →→Cytochrome a(Fe²+) Cytochrome (Fe³+) + e→Cytochrome (Fe²+) Cytochrome 4 (Fe³") + →Cytochrome (Fe²¹) CoQH+H+→ CoQH₂ (coenzyme Q CoQ + 2H* + 2e → CoQH₂ Cytochrome (Fe³+) + →Cytochrome (Fe²+) Fumarate + 2H* + 2e → Succinate CoQ + H+ → CoQH [FAD] + 2H + 2e →→ [FADH₂] Cytochrome & (Fe³+) + →Cytochrome & (Fe) Oxaloacetate + 2H* + 2e →→Malate Pyruvate + 2H+ 2e →Lactate Acetaldehyde + 2H* + 2e¯ →→ Ethanol FMN + 2H+ 2e → FMNH₂ FAD + 2H+ 2€ → FADH₂ 1,3-bisphosphoglycerate + 2H* + 2e → Glyceraldehyde-3-phosphate + P NAD + 2H+ + 2e →NADH+H* NADP+ + 2H+ + 2e → NADPH + H* a-ketoglutarate + CO₂ + 2H+ 2e → Isocitrate Succinate + CO₂ + 2H" + 2e¯ → a-ketoglutarate + H₂O E" (V) 0.816 0.771 0.350 0.290 0.254 0.220 0.190 0.060 0.050 0.031 0.030 0.003-0.091 -0.100 -0.166 -0.185 -0.197 -0.219 -0.219 -0.290 -0.320 -0.320 -0.380 -0.670 *Typical values for reduction of bound FAD in flavoproteins such as succinate dehydrogenase. Note that we have shown a number of components of the electron transport chain individually. We are going to see them again as part of complexes. We have also included values for a number of reactions we saw in earlier chapters.
Transcribed Image Text:TABLE 20.1 Standard Reduction Potentials for Several Biological Reduction Half Reactions Reduction Half Reaction O₂ + 2H* + 2€ → H₂O Fe³+ + →Fe²+ Cytochrome ₂ (Fe³+) + →Cytochrome (Fe²+) Cytochrome a(Fe³+) + →→Cytochrome a(Fe²+) Cytochrome (Fe³+) + e→Cytochrome (Fe²+) Cytochrome 4 (Fe³") + →Cytochrome (Fe²¹) CoQH+H+→ CoQH₂ (coenzyme Q CoQ + 2H* + 2e → CoQH₂ Cytochrome (Fe³+) + →Cytochrome (Fe²+) Fumarate + 2H* + 2e → Succinate CoQ + H+ → CoQH [FAD] + 2H + 2e →→ [FADH₂] Cytochrome & (Fe³+) + →Cytochrome & (Fe) Oxaloacetate + 2H* + 2e →→Malate Pyruvate + 2H+ 2e →Lactate Acetaldehyde + 2H* + 2e¯ →→ Ethanol FMN + 2H+ 2e → FMNH₂ FAD + 2H+ 2€ → FADH₂ 1,3-bisphosphoglycerate + 2H* + 2e → Glyceraldehyde-3-phosphate + P NAD + 2H+ + 2e →NADH+H* NADP+ + 2H+ + 2e → NADPH + H* a-ketoglutarate + CO₂ + 2H+ 2e → Isocitrate Succinate + CO₂ + 2H" + 2e¯ → a-ketoglutarate + H₂O E" (V) 0.816 0.771 0.350 0.290 0.254 0.220 0.190 0.060 0.050 0.031 0.030 0.003-0.091 -0.100 -0.166 -0.185 -0.197 -0.219 -0.219 -0.290 -0.320 -0.320 -0.380 -0.670 *Typical values for reduction of bound FAD in flavoproteins such as succinate dehydrogenase. Note that we have shown a number of components of the electron transport chain individually. We are going to see them again as part of complexes. We have also included values for a number of reactions we saw in earlier chapters.
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