1) Which of the following electron donor/electron acceptor pairs represent poten

Question

1) Which of the following electron donor/electron acceptor pairs represent potential energy reactions for bacterial growth? What is the energy available in KJ per electron equivalent? CaseElectron Donor Electron Acceptor Carbon dioxide (methanogenesis Fe (reduction to Fe Acetate Acetate Acetate Glucose reduction to H2 H2 S (oxidized to sulfate CH4 NH4 (oxidized to NO3 H (reduction to H2 Carbon dioxide (methanogenesis Nitrate (denitrification to N2 Nitrate (denitrification to N Nitrate (denitrification to N2 SO4 (reduction to H2S + HS

Explanation / Answer

We know that,

                                                       Gr = Go’ (acceptor) - Go’ (donor)

Where, Gr = Free energy for full reaction, Go’ (acceptor) = Free energy formation of electron acceptor & Go’ (donor) = Free energy formation of electron donor.

When, Gr<0, the process is exergonic & represents potential reaction for bacterial growth.

Case Values of Gr (KJ/ e- eq) Remarks A Gr = 23.53 – 27.40 = -3.87 Bacterial growth happens B Gr = -74.27 – 27.40 = -101.67 Bacterial growth happens C Gr = 39.87 – 27.40 = 12.47 Bacterial growth will not happen D Gr = 39.87 –41.35 = -1.48 Bacterial growth happens E Gr = 23.53 – 39.87 = -16.34 Bacterial growth happens F Gr = -72.2 – 39.87 = -112.07 Bacterial growth happens G Gr = -72.2 – 19.15 = -91.35 Bacterial growth happens H Gr = -72.2 – 23.53 = -95.73 Bacterial growth happens I Gr = 20.85 – (-32.93) = 53.78 Bacterial growth will not happen

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