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Consider a cell membrane at 298K which has glucose at the concentration of 200mM inside the cell and 20 mM outside the cell, with the voltage being 50 mV lower in the interior. Calculate the molar free energy difference for transporting a glucose molecule from the exterior to the interior of the cell.A. -2.7 kJ/molB. -5.7 kJ/molC. +2.7 kJ/molD. +5.7 kJ/mol

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Answer:

D. +5.7 kJ/mol

Explanation:

Molar free energy (ΔG) in the transportation of uncharged molecules as glucse through a cell membrane from the exterior to the interior of the cell is defined as:

ΔG = RT ln C in / C out

knowing R is 8,314472 kJ/molK; T is 298K Cin = 200mM and Cout = 20mM

ΔG = 5,7 kJ/mol

Right answer is:

D. +5.7 kJ/mol

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