sample_midterm_2_2006_key

sample_midterm_2_2006_key - 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? -70mV to +65 mV 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? Diffusion, uptake, degredation 2b. (4 points) What four criteria are used to determine whether a particular transmitter is used at a particular synapse? 1) is the neurotransmitter synthesized by the presynaptic cell? 2) is the neurotransmitter stored in the presynaptic neuron? 3) is the neurotransmitter released from the presynaptic terminal? 4) does application of the neurotransmitter to the postsynaptic cell mimic the
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sample_midterm_2_2006_key - NAME STUDENT ID NPB100 Spring...

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