In another key reaction in glycolysis, dihydroxyacetone phosphate (DHAP) is isom

Question

In another key reaction in glycolysis, dihydroxyacetone phosphate (DHAP) is isomerized into glyceraldehyde-3-phosphate (GAP):

Because ?G?? is positive, the equilibrium lies to the left. The equilibrium constant, and the equilibrium fraction of GAP from the above, at 37 ?C is Keq= 5.4x10?2 Part B In the cell, depletion of GAP makes the reaction proceed. What will ?G be if the concentration of GAP is always kept at 1/100 of the concentration of DHAP?

Explanation / Answer

B) we know that

G = G0 + RT ln (Keq)

G0 = 7.5 KJ / mole

R = 8.314 X 10^-3 KJ / mol K

T = 310 K

Keq = [GAP] / [DHAP] = 1/100 (Given : GAP = [DHAP] / 100

So G = 7.5 + ( 0.008314 X 310) ln (1/100)

G = 7.5 + 2.577 ln (0.01) = -4.36 KJ / mole

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