A scientist claims that he has isolated a bacterium that can convert 1 molecule

Question

A scientist claims that he has isolated a bacterium that can convert 1 molecule of glucose
into 57 molecules of ATP. In this scheme, the oxidation of glucose to CO2 and water is
coupled with the reaction ADP + Pi ? ATP. The ?G for the reaction ADP + Pi ? ATP is
+12 kcal/mol and the ?G for the oxidation of glucose is -686 kcal/mol. Should you
celebrate this discovery or do you suppose something may be wrong with it? Explain.

Explanation / Answer

No, we should not because it is not accompanied by any net energy production. Proof: A/Q G for the oxidation of glucose is -686 kcal/mol if Glucose produces 57 gtp & G for the reaction ADP + Pi --> ATP is +12 kcal/mol Then total energy produced is 12 * 57 = 684 kcal/mol So, Net energy produced in reaction is -686+ 648 = -2 kcal/mol

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