Question

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Redox couple Eo (V) CO2/glucose (-0.43) 24 e 2H /H2 (-0.42) 2e CO2/methanol(-0.38) 6 e NAD /NADH (-0.32) 2 e -0.50 --0.40 -0.30 CO2/acetate (-0.28) 8 e E-0.20 S /H2S (-0.28)2 e SO22 /H2S(-0.22) 8 e Pyruvate/lactate (-0.19) 2 e SO62-S2032(+0.024) 2 e -0.10 0.0 Fumarate/succinate (+0.03) 2 e +0.10 Cytochrome boxred (+0.035) 1 e +0.20 Fe3 /Fe2 (+0.2) 1 e, (pH 7) Ubiquinone ox/red (+0.11) 2 e Cytochrome Cox/red (+0.25) 1 e Cytochrome a ox/red (+0.39) 1 e NO3 /NO2 (+0.42) 2 e +0.30 +0.40 E +0.50 +0.60 +0.70 NO3-글N2(+0.74) 5 e" Fe3 /Fe2* (+0.76) 1 e, (pH 2) 02/H20(+0.82) 2 e +0.80 +0.90 Imagine a circumstance in which H2 is serving as an energy source. Which electron acceptor would generate the most energy when paired with H2? Cytochrome c (oxidized) NO1 Glucose CO2 Fumarate

Answer 1

Co2 is having highest reduction potential and H2 being electron donor having lowest reduction potential in redox couple so maximum difference is there between two molecules . Product formed after reduction will be acetate like NAD gets reduced to NADH . Energy released in ETC is due to electron losing energy when being transfered to more electronegative molecule having more reduction potential .