151_Midterm1_2007

151_Midterm1_2007 - MCDB 151/251 Name Midterm 1 Fall 2007...

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MCDB 151/251 Name __________________________________________ 1 Midterm 1, Fall 2007. Your answers should be precise and succinct. They should fit in the space provided and be easily legible. 1a) Camillo Golgi’s view of the nervous system is described as the “reticular theory”, while that of Santiago Ramón y Cajal is described as the “neuron doctrine.” What is the difference between these 2 views? (3) 1b) What technical advancement in the 1950s completely resolved this conflict? _____________________________________________________________. (2) 2) If Camillo Golgi was shown results described in A and B below, which do you think would be most likely to persuade him to endorse Cajal’s “neuron doctrine” and why? (3) A. Images of staining by an antibody that labels all of the neurons in a piece of brain tissue, but labels no cells in samples of liver and kidney tissues. B. An image of different types of neurons injected with the dye Lucifer yellow. 3a) A multipolar motor neuron is often used to show the relationship between structural and functional polarity in neurons. Draw a neuron of this type and label its dendrites, cell body, axon, and axon terminal branches. Describe the relationship between structural and functional polarity. (4)
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MCDB 151/251 Name __________________________________________ 2 3b) What structure uniquely defines the cell body? ____________________________________. (2) 3c) Not including differences in electrical activity, list a cellular property shared by dendrites and the cell body?________________________________________________________________________ ______________________________________ . (2) 3d) Not including differences in electrical activity, list the most prominent cytoplasmic difference between dendrites and axons. ________________________________________________________ ___________________________________________. (2) 4) (6 pts) Briefly list the changes in ionic permeabilities that are occurring at points A & B of the action potential. Point A: Point B: 5) (4 pts) How are ion concentration gradients established across a neuronal cell membrane?
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MCDB 151/251 Name __________________________________________ 3 6) A cell containing only voltage-gated Na + channels, voltage-gated K + channels and background K + channels has the following intracellular and extracellular ionic composition:
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This document was uploaded on 10/21/2009.

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151_Midterm1_2007 - MCDB 151/251 Name Midterm 1 Fall 2007...

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