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Biology 59 Online
OpenStudy (anonymous):

ATP hydrolysis in many living cells has a ΔG of -12 kcal/mol. The Na+ /glucose cotransporter uses the energy of the plasma membrane sodium gradient to drive transport of glucose into the cell, even if the concentration of glucose inside the cell is already higher than outside. Hypothetically, how many Na+ ions would have to cross the membrane in each transport cycle to provide a free energy change comparable to that of ATP hydrolysis? Use the following conditions: external Na+ = 125 mM; internal Na+ = 12.5 mM; T= 37o C; membrane potential = -68 mV.

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