Hey! This is a practice and I would like to know the method to solve a problem l

Question

Hey! This is a practice and I would like to know the method to solve a problem like this:

Is this proposed metabolic pathway energetically favorable? Couple 0.50 0.40 -0.30 -0.20 0.10 0.0 +0.10 +0.20 +0.30 +0.40 +0.50 +0.60 +0.70 +0.80 +0.90 glucose (-0.43) 24 e 2H/2 (-0.42) CO2/methanol (-0.38) 6 e NAD /NADH (-0.32) 2 e CO2/acetate (-0.28) 8 e S°/H2S (-0.28) 2 SO,2-/H2S(-0.22) 8 e 2 e 8 H 8e Out 8e Electron transfer chain vate/lactate (-0.19) 2 e S,01S202(+0.024) 2 Fumarate/succinate (+0.03) 2 e Cytochrome bxred (+0.035)1 e Fe3/Fe2 (+0.2)1 e, (pH 7) Ubiquinoneox/red (+0.11) 2 e Cytochrome Cox/red (+0.25) 1 e Cytochrome aox/red (+0.39) 1 e NO3 /NO2 (+0.42) 2 e In 8e a)Yes HSSo29 H 4 H2O b)No 8 H transfer 4e ote 4e 2 Lactate 2 Pyruvate2aetoe NOg7½ N2 (+0.74) 5 e- Fe3+/Fe2+ (+0.76) 1 e", (ph12)- ½o2/H20 (+0.82) 2 e. + 2 CO2

Explanation / Answer

To solve this type of problem, we need to look at the oxidation / reduction potential table provided and locate the position of SO42- , it is a weak oxidising agent. Th termial electron acceptor in this pathway is not able to produce enough energy.

Is this proposed metabolic pathway energetically favourable?

b) No

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