Sample Midterms

Sample Midterms - YOUR NAME_ Student ID#_ MIDTERM 1 SPRING,...

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YOUR NAME__________________________ Student ID#_________________ 1 NPB 100 MIDTERM 1 SPRING, 2005 Your signature______________________ Question Score Total 1 6 2 7 3 10 4 6 5 18 6 5 7 20 8 20 9 8 TOTAL 100
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YOUR NAME__________________________ Student ID#_________________ 2 Question 1. (6 points) At which point(s) in this action potential is the cell’s membrane more permeable to potassium than it is to sodium? CIRCLE AS MANY ANSWERS AS ARE CORRECT! A B C D Question 2. (7 points) Ouabain is a toxin that prevents the Na + /K + ATPase from working. 2a. (3 points) You apply ouabain to a cell with a resting membrane potential of –60 mV, and you wait several hours. This will have which effect on the cell’s membrane potential? CIRCLE ONE ANSWER: depolarize hyperpolarize no effect 2b. (4 points) Explain your answer to question 4a. GO ON TO THE NEXT PAGE!
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YOUR NAME__________________________ Student ID#_________________ 3 Question 3. (10 points) You are studying a cell with no chloride transporters or exchangers. The resting membrane potential of this cell is -65 mV. Remember that log 0.01= -2, log(0.1) = -1, log(1) = 0, log(10) = 1, log(100) =2, log(1000)=3 3a. (5 points) What is the equilibrium potential for chloride? Explain your answer. 3b. (1 point) Will opening chloride channels in this cell cause depolarization or hyperpolarization?
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This note was uploaded on 05/02/2008 for the course NPB 100 taught by Professor Chapman during the Spring '08 term at UC Davis.

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Sample Midterms - YOUR NAME_ Student ID#_ MIDTERM 1 SPRING,...

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