NPB 100 Fall 08 Exam 3

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

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Name _____________________________________ pg. 1 of 6 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) 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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Name _____________________________________ pg. 2 of 6 2. You are recording from the retinal ganglion cell of a person that has a mutation that causes the photoreceptor to depolarize when light is shined on it. Everything else about the retinal circuit is normal as shown below. Draw the receptive field of the neuron that the arrow is pointing to. Sign-conserving Excitatory Legend Sign-reversing - + + + + + + + + +
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Name _____________________________________ pg. 3 of 6 Part 3: Miscellaneous Questions 3.1 Simple multiple choice (8 points) An African mole that is blind navigates by sensing vibrations in the sand. It does so by the use of hair cells in a vestibular organ. These cells are like typical vertebrate hair cells except for the following. (1) This hair cell has a high intracellular concentration of sodium ,and (2) when pushed in the correct direction these cells open a cation channel that is very permeable to sodium. When this cell is pushed in the right direction, the receptor potential will be __________________ when compared to a hair cell with normal internal sodium concentrations.
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This note was uploaded on 12/10/2008 for the course NPB 100 taught by Professor Chapman during the Fall '08 term at UC Davis.

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

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