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NPB 100 Fall 08 Exam 3

NPB 100 Fall 08 Exam 3 - Name pg 1 of 6 Part 1(14 points 2...

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Name _____________________________________ pg. 1 of 6 Voltage (mv) Voltage (mv) Voltage (mv) Voltage (mv) Voltage (mv) Voltage (mv) Voltage (mv) Voltage (mv) Part 1: (14 points, 2 points for each correct elimination, -14 points for eliminating the correct choice) You stimulate a photoreceptor with light and record the following receptor potential. You now manipulate the cell in a way that decreases the membrane capacitance. Which of the following choices could be correct under the new condition (Note the original result is shown in solid line and the choice for new is shown with a heavy dashed line) Light on Time (ms) Voltage (mv) Light on Time (ms) Light on Time (ms) a) e) original Lower capacitance Light on Time (ms) Light on Time (ms) Light on Time (ms) Light on Time (ms) Light on Time (ms) Light on Time (ms) b) c) d) f) g) h) Faster and same Δ Vss Too slow going down and non- zero right side makes no sense Same speed going down is wrong And starting to recover before loght turns off is wrong Same speed going down is wrong Δ Vss changing is wrong Δ Vss changing is wrong Δ Vss changing is wrong Too slow going down and recovery should not be identical
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