Angela PS 1 key x - 1 Section Thu 5-5:50pm HSS 2321 OH Thu...

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1 TA: Angela Chang Section: Thu 5-5:50pm HSS 2321 [email protected] OH: Thu 4pm HSS 1145A BIPN 100 PROBLEM SET WEEK 1 DIFFUSION AND OSMOSIS 1. A U-tube has the initial setup shown to the right. Side A contains 1M of glucose. Side B contains 0.5M of glucose. The membrane separating A and B is permeable to glucose. At equilibrium: a. Which side has more glucose? Equal b. Which side has the higher water level? Equal 2. A second U-tube is prepared with the following: Side A contains 1M of glucose, 2M of sucrose. Side B contains 0.5M of glucose, 1.5M of sucrose. The membrane separating A and B is replaced with a semi-permeable membrane not permeable to sucrose, but permeable to glucose. At equilibrium: a. Which side has more glucose? Equal b. Which side has more sucrose? A c. Which side has the higher water level? A (A is hypertonic to B.) 3. Transport across the membrane can be grouped into passive and active transport. a. What molecules travel via simple diffusion ? Gases, steroid hormones, fat-soluble vitamins b. What molecules travel via
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  • Fall '07
  • French
  • Electrochemistry, concentration gradient, higher water level

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