10/23/2014 11:00 PM 88.7/10010/23/2014 08:52 PMM Gradebook Print Calculator Peri

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10/23/2014 11:00 PM 88.7/10010/23/2014 08:52 PMM Gradebook Print Calculator Periodic Table Question 9 of 15 Map sapling learning The Na-glucose symport system of intestinal epithelial cells couples the "downhill" transport of two Na" ions into the cell to the "uphill" transport of glucose, pumping glucose into the cell against its concentration gradient. If the Nat concentration outside the cell ([Nalout) is 151 mM and that inside the cell ([Na lin) is 21.0 mM, and the cell potential is -53.0 mV (inside negative), calculate the maximum ratio of [glucose]in to [glucose]out that could theoretically be produced if the energy coupling were 100% efficient. Assume the temperature is 37 . Incorrect Number glucosen Remember the energy necessary to pump the glucose is a positive number, equal to the negative energy available from the transport of the Na ions. The ratio should be greater than glucose glucose lout Previous Give Up & View Solution Try Again Next Exit

Explanation / Answer

your formula is correct.. Before you look for the glucose ratio you need to multiply delta G by 2 because the question says that 2 Na+ are needed.
Next delta G needs to be positive so that when you insert it into [Glu]in/[Glu]out= e^(delta G/ (F*delta psi). where F= 96.5 kJ/V*mol; and delta psi =cell potential 50mV.

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