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Eaxm-2-key - INTRO BIO Dr Holycross For the following...

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INTRO BIO - Dr. Holycross Exam 2 For the following questions, match the labeled component of the cell membrane with its description. 1) peripheral protein Answer: D 2) cholesterol Answer: E 3) fiber of the extracellular matrix Answer: A 4) Which of the following is a reasonable explanation for why unsaturated fatty acids help keep any membrane more fluid at lower temperatures? A) The double bonds form kinks in the fatty acid tails, forcing adjacent lipids to be further apart. B) Unsaturated fatty acids have a higher cholesterol content and therefore more cholesterol in membranes. C) Unsaturated fatty acids permit more water in the interior of the membrane. D) The double bonds block interaction among the hydrophilic head groups of the lipids. E) The double bonds result in shorter fatty acid tails and thinner membranes. Answer: A 5) Which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly? 1
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6) When water passes quickly through a cell membrane it does so because The solutions in the two arms of this U - tube are separated by a membrane that is permeable to water and glucose but not to sucrose . Side A is half filled with a solution of 2 M sucrose and 1 M glucose. Side B is half filled with 1 M sucrose and 2 M glucose (the concentration of total solute on the two sides is equal). Initially, the liquid levels on both sides are equal. Figure 7.2 7) Initially, in terms of tonicity, the solution in side A with respect to that in side B is 8) After the system reaches equilibrium, what changes are observed? A) The molarity of sucrose and glucose are equal on both sides. B) The molarity of glucose is higher in side A than in side B. C) The water level is higher in side A than in side B. D) The water level is unchanged. E) The water level is higher in side B than in side A. Answer: C 9) You are designing a new drug. In order for this drug to work, it must enter the cytoplasm of specific target cells but not other cells. Which of the following would be a factor that determines whether the molecule enters the cell? 2
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