3. The following table presents a list of different energy reactions in which gl

Question

3. The following table presents a list of different energy reactions in which glucose is the electron donor ("food G" =-2,880 kJ/mol glucose Go -2,720 kJ/rnol glucose source") aerobic oxidation: C6H1206 + 602 CO2 + 6H3O denitrification: 5C6H1206 + 24N05 + 24H+ 30CO2 + 42H20+12N2 sulfate reduction: 2C6H12Og +6SO2--9H+ 12CO2+12H20+3H2S +3HS_ Go492 kJ/mol glucose (a) What are the electron acceptors in each of the reactions? (b) Please comment on which reactions would be more favorable with respect to the different electron acceptors

Explanation / Answer

(a) In reaction 1, O2 is the electron acceptor. In reaction 2, NO3- is the electron acceptor. In reaction 3, SO42- is the electron acceptor.

(b) This could be explained looking at the change in free energy. Among the three reactions, the aerobic oxidation has the highest negative free energy. Hence, aerobic oxidation would be more favorable with respect to different electron acceptors.

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