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28 Sep 2019
What is the maximum ratio of [Iâ]in to [Iâ]out that could be maintained at equilibrium if the Na+ gradient is kept constant (by other transport processes) such that transport of Na+ into the cell has a ?G of â30 kJ/mol. Assume the membrane potential is â155 mV (inside negative) and that transport of iodide does not affect the size of the Na+ gradient. Perform your calculation at body temperature (37°C).
Hint: You will need to balance unfavorable the iodide ion transport against this favorable energy for Na+ transport.
What is the maximum ratio of [Iâ]in to [Iâ]out that could be maintained at equilibrium if the Na+ gradient is kept constant (by other transport processes) such that transport of Na+ into the cell has a ?G of â30 kJ/mol. Assume the membrane potential is â155 mV (inside negative) and that transport of iodide does not affect the size of the Na+ gradient. Perform your calculation at body temperature (37°C).
Hint: You will need to balance unfavorable the iodide ion transport against this favorable energy for Na+ transport.
Deanna HettingerLv2
28 Sep 2019