Refer to the table below to calculate the net free energy change when anaerobic butyrate metabolism is coupled to methanogenesis

Question

Refer to the table below to calculate the net free energy change when anaerobic butyrate metabolism is coupled to methanogenesis 136 kJ mol TABLE 13 6 Syntrophy Reactions Producing and Consuming H Genus Reaction 3H reduces an oxidant HCO SO or NO3 Methanospirillum Desulfovibrio Desulfovibrio Syntrophic catabolism producing H Syntrophus Syntrophomonas 4H HCO3 H CH 3H O 4H SO H HS 4H O 4H NO3 2H NH 3H O Benzoate 7H O 3 acetate HCO3 3H 3H Butyrate 2H O 2 acetate H 2H kJ mol a 136 152 600 70 49 Oxidant for syntrophy HCO3 25 AG kJ mol b 5 So NO3 2 45 33 13 18 AG is the standard free energy change at pH 7 when the concentrations of reactants and products are the same PAG was the measured free energy change at pH 7 when syntrophic metabolism stopped Michael McInerney et al 2007 PNAS 104 7600 Ralf Cord Ruwisch et al 1988 Arch Microbiol 149 350 Bradley E Jackson and Michael J McInerney 2002 Nature

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