Different Concentrations of Ions on Either Side of a Cell

question 96

Multiple Choice

Different concentrations of ions on either side of a cell membrane constitute a concentration cell, which is described by the Nernst equation given below. A cell must expend energy to maintain this concentration gradient by moving ions from one side of the membrane to the other. How much energy must be expended to transport 1 mole of sodium ions across a membrane when the sodium ion concentration is 0.10 M on one side of the membrane and 0.010 M on the other side, and the temperature is 37C (body temperature) ? (Given: ,  2.71 V; F  96,485 C; 1 J  1 C V; R  8.315 J / (mol K) )
E  E - InQ

• A)50 kJ
• B)260 kJ
• C)6.0 kJ
• D)250 kJ
• E)6,000 kJ

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