The synthesis of ATP from ADP and P_i is a(n) _____ reaction with _____ $\Delta$G. A)exergonic; a positive B)endergonic; a negative C)exergonic; a negative D)endergonic; a positive E)reversible; zero

Question

Quizplus · Accepted Answer

The synthesis of ATP from ADP and P_i is an endergonic reaction, as energy is required to form the bonds between the phosphate groups. Therefore, the delta G value for this reaction is positive. The question states that there is a F1F1F1S1F1F1F10G, which is the ion gradient across the inner mitochondrial membrane that drives the synthesis of ATP. This gradient is negative, meaning that there is a higher concentration of protons outside the membrane than inside, and therefore energy is released when protons move down their concentration gradient into the matrix through ATP synthase. Because the synthesis of ATP is endergonic and the delta G value is positive, energy must be supplied to drive the reaction. This energy is provided by the negative delta G value of the ion gradient, making the total delta G value for the coupled reaction negative. Therefore, the correct answer is D: endergonic; a positive.

The Synthesis of ATP from ADP and Pi Is A(n) Δ\DeltaΔ

The Synthesis of ATP from ADP and P_i Is A(n) $\Delta$