A biosynthetic step has

CHEMISTRY · Subjective · A Level · Chemistry · Thermodynamics · Thermodynamics

Problem

A biosynthetic step has ΔG∘=+52 kJ mol−1\Delta G^{\circ}=+52\,\text{kJ\,mol}^{-1}. Any two of the following potential driving reactions may be coupled to it (each reaction can be used at most once) to achieve an overall ΔG∘\Delta G^{\circ} between −20 kJ mol−1-20\,\text{kJ\,mol}^{-1} and −5 kJ mol−1-5\,\text{kJ\,mol}^{-1}. A. ATP →\rightarrow ADP + Pi+\,\text{P}_i  ΔG∘=−30.5 kJ mol−1\Delta G^{\circ}=-30.5\,\text{kJ\,mol}^{-1} B. PEP →\rightarrow pyruvate + Pi+\,\text{P}_i  ΔG∘=−61.9 kJ mol−1\Delta G^{\circ}=-61.9\,\text{kJ\,mol}^{-1} C. GTP →\rightarrow GDP + Pi+\,\text{P}_i  ΔG∘=−30.6 kJ mol−1\Delta G^{\circ}=-30.6\,\text{kJ\,mol}^{-1} D. Acetyl phosphate →\rightarrow acetate + Pi+\,\text{P}_i  ΔG∘=−43.4 kJ mol−1\Delta G^{\circ}=-43.4\,\text{kJ\,mol}^{-1} Identify one pair of driving reactions that satisfies the requirement. List both letters.

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