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IMG_0004_NEW_0004 - You might have predicted that since the...

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You might have predicted that since the water molecules in the cells had more free energy than those in the saturated salt solution, more water molecules would leave than would enter the cell, causing the cell volume to shrink. In distilled water, the water molecules outside the cell will have more free energy than those inside and thus more water molecules enter than leave the cell. This causes the cells to bloat as they take up water, but despite the elasticity of the cell membrane, they have a finite ability to increase in size. At some point, the cells will "pop" much like over-inflating a balloon. We call this phenomenon cell lysis. So water can pass through the cell membrane with relative ease. How easily can other substances pass through the cell membrane? And if we hypothesize that there are "pores' in the membrane and that these substances are moving through these membrane pores, do different sized molecules enter cells at different speeds? Exercise 2 is designed in a special way to answer these questions. We know that red blood cells have an internal
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This note was uploaded on 12/29/2011 for the course MBB 222 taught by Professor Briscoe during the Fall '10 term at Simon Fraser.

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