sample_midterm_2_2006

sample_midterm_2_2006 - NAME_ STUDENT ID#_ NPB100 Spring...

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NAME___________________________________ STUDENT ID#_______________________ 1 NPB100 Spring Quarter 2006 Midterm 2 Your signature______________________ Please check this box if you do not want your exam returned in the bins in the hallway… Question Score Total 1 10 2 5 3 6 4 15 5 8 6 10 7 10 8 15 9 11 10 10 TOTAL 100
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NAME___________________________________ STUDENT ID#_______________________ 2 Question 1. (Total: 10 points) You are given the following information about a hypothetical cell. Use this information to answer the questions below. E x = -70 mV E Y = -50 mV E Z = +65 mV The threshold for firing action potentials is –25 mV. 1a. (2 points) What range of membrane potentials, V M , would be possible for the cell if its membrane contained only X, Y, and Z selective channels? 1b. (2 points) Ion Z is in higher concentration outside the cell than inside. What is its charge? Circle One: Positive Negative Neutral 1c. (2 points) If V M = -70 mV, and Y ions are negatively charged, what will be the direction of Y ion flow through open Y channels? Circle One: Out of the cell Into the cell No net flow 1d. (2 points) If V M = -70 mV, what effect would opening more Z-selective channels have on the membrane potential? Circle One: Depolarize the cell Hyperpolarize the cell No effect 1e. (2 points) If V M = -70 mV, opening which channels would result in a depolarizing, inhibitory potential? Circle One: X selective channels Y selective channels Z selective channels GO ON TO NEXT PAGE!
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NAME___________________________________ STUDENT ID#_______________________ 3 Question 2. (Total: 5 points) 2a. (3 points) What are the three mechanisms of removing neurotransmitter from the synaptic cleft? 2b.
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sample_midterm_2_2006 - NAME_ STUDENT ID#_ NPB100 Spring...

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