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Reading: Required: Allen Chapter 18 Assigned Problems: - Problems discussed in class - Posted problems Solute Transport

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Two compartments are separated by a membrane. The first compartment has a 10-fold higher concentration of compound C than the second compartment, i.e. C 1 = 10 C 2 . What is the molar free energy change for moving solute from compartment 1 to compartment 2? Assume room temperature. Concentration Gradients (1) 1. −?. ??? ?𝐉/?𝐨? 2. −?, ??? ?𝐉/?𝐨? 3. −?, ??? ?𝐜𝐚?/?𝐨? 4. + ?. ??? ?𝐉/?𝐨? 5. + ?, ??? ?𝐉/?𝐨?
Two compartments are separated by a membrane. The first compartment has a 10-fold higher concentration of compound C than the second compartment, i.e. C 1 = 10 C 2 . What is the molar free energy change for moving solute from compartment 1 to compartment 2? Assume room temperature. Concentration Gradients (1) 1. −?. ??? ?𝐉/?𝐨? Answer:

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Consider a cell surrounded by a membrane at 298 K. The glucose concentration is 200 mM inside the cell, and 2.00 mM outside the cell. The voltage is 150 mV lower (more negative) in the cell’s interior. Calculate the molar free energy change for movement of glucose from the interior to the exterior. Concentration Gradients (2) 1. −??. 𝟗 ?𝐉/?𝐨? 2. +??. ? ?𝐉/?𝐨? 3. −??. ? ?𝐉/?𝐨? 4. + ?. ? ?𝐉/?𝐨? 5. − ?. ? ?𝐉/?𝐨?
Consider a cell surrounded by a membrane at 298 K. The glucose concentration is 200 mM inside the cell, and 2.00 mM outside the cell. The voltage is 150 mV lower (more negative) in the cell’s interior. Calculate the molar free energy change for movement of glucose from the interior to the exterior. Concentration Gradients (2) 3. −??. ? ?𝐉/?𝐨? Answer: Δ G = RT ln C 2 /C 1 + z F (V int V out ) z = 0; V int = - 0.150 V; V out = 0 V; Δ G = 2,478 J/mol × ln(2mM/200mM) + 0

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Consider a cell surrounded by a membrane at 298 K. The glucose concentration is 100 mM inside the cell, and 20 mM outside the cell. The voltage is 100 mV lower (more negative) in the cell’s interior. Calculate the molar free energy change for movement of glucose from the exterior to the interior. Concentration Gradients (3) 1. +??? ?𝐉/?𝐨?
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• Spring '14
• Sodium, Adenosine triphosphate, Ion, free energy change

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