One Way Our Bodies Produce ATP Is to Couple the Formation

question 37

Multiple Choice

One way our bodies produce ATP is to couple the formation of ATP from ADP with the hydrolysis of phosphoenopyruvate (PEP) ,as shown below. PEP + ADP + H⁺(aq) → pyruvate + ATP Δ_rG°′ = ?
Given the following thermodynamic data,
PEP + H₂O(l) → pyruvate + HPO₄^2-(aq)
Δ_rG°′ = −61.9 kJ/mol-rxn
ATP + H₂O(l) → ADP + HPO₄^2-(aq) + H⁺(aq)
Δ_rG°′ = −30.5 kJ/mol-rxn
Calculate the standard Gibbs free energy of reaction for the formation of ATP from the hydrolysis of PEP.

• A) 92.4 kJ/mol-rxn
• B) −31.4 kJ/mol-rxn
• C) −92.4 kJ/mol-rxn
• D) 31.4 kJ/mol-rxn
• E) −46.7 kJ/mol-rxn

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