Exam II 2006 - Name Biology 202 Nov 2 2006 Exam 2 page 2 3...

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Name: Biology 202 ________________________ Nov. 2, 2006 Exam 2 page Value Points 2 10 _____ 3 12 _____ 4 14 _____ 5 8 _____ 6 10 _____ 7 6 _____ 8 10 _____ 9 13 _____ 10 9 _____ 11 8 _____ Total 100 _____ The University of Pennsylvania has a Code of Academic Integrity. For this exam, this means that cheating is defined as using or attempting to use unauthorized assistance, material or study aids in this exam, as well as knowingly helping or attempting to help another during the course of this exam. Your signing this exam signifies your pledge to honor and uphold this Code of Academic Integrity during the course of this examination. Signature :_____________________ 1
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Name: BE BRIEF AND CONCISE! BEING BRIEF DECREASES CHANCES OF BEING WRONG WRITE LEGIBLY ONLY IN THE SPACE PROVIDED Q1. Multiple choice: Pick the best answer (read all choices before selecting) ( 2 pts ea ) A. Both of these components are characteristic for the extracellular leaflet of plasma membrane: a. Phosphatidylethanolamine and galactocerebroside b. Sphingomyelin and phosphatidylcholine c. Phosphatidylserine and phosphatidylinositol d. Cholesterol and sphingomyelin e. GM1 ganglioside and cholesterol B. Making the polyunsaturated fatty acid side chains on a phospholipid more saturated would most likely: a. Decrease the phase transition temperature of that phospholipid b. Increase the phase transition temperature of that phospholipid c. Change the melting point but not the fluidity of that lipid d. Increase the diffusion coefficient of that lipid at room temperature e. Change it from a fat to an oil C. Signal sequence that directs a secreted protein into ER is recognized by: a. SRP b. SRP receptor in ER membrane c. Protein translocator in the ER membrane d. Protein translocator and SRP e. Signal peptidase D. Function of scramblase is: a. Insert newly synthesized phospholipids into the membrane b. Remove specific lipids from the membrane c. Flip-flop phospholipids to generate an asymmetric lipid bilayer d. Flip-flop phospholipids to generate a symmetric lipid bilayer e. Change a polar group in the phospholipids head E. Clathrin-coated vesicles pinch off a. ER b. Golgi c. Plasma membrane d. Golgi and ER e. Golgi and plasma membrane 2
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Name: F. Rab a. regulates formation of coated vesicles b. is a GEF for a small GTPase c. is involved in disassembly of clathrin coat d. is involved in vesicle docking before fusion e. activates vesicle scission G. Early endosomes a.
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