exam 1 BIO365R 2006

exam 1 BIO365R 2006 - Name_ Time of Class_ First Exam- BIO...

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Name_______________________ Time of Class____________________ First Exam- BIO 365R Fall 2006 Semester There are 36 questions, worth a total of 100 points. There are 9 pages: Make sure you have all 9 pages. Questions 1-25 below (worth 2 pts each) are either Multiple Choice or True False. Mark your answers for questions 1-25 on the Scantron . Questions 25-36 are either short answer, require a calculation or require drawing a graph. The point values of these questions are given next to the question. GOOD LUCK! 1) The knee jerk reflex involves only neurons from the peripheral nervous systems. A) True B) False 2) Conductance = 1/Resistance. A) True B) False 3) Three compartments have initially the following ion concentrations: Ion Compartment1 Compartment2 Compartment3 K + 10 mM 10 mM 100 mM Na + 100 mM 10 mM 50 mM Cl - 110 mM 20 mM 150 mM The membrane between compartment 1 and compartment 2 is permeable for sodium and chloride (equal relative permeabilities) and the membrane between compartment 2 and 3 is permeable for potassium only. In equilibrium there is: A) No voltage between compartment 1 and 2 and positive voltage between compartment 2 and 3 B) Negative voltage between compartment 1 and 2 and positive voltage between compartment 2 and 3. C) Postive voltage between compartment 1 and 2 and no voltage between compartment 2 and 3. D) No voltage between compartment 1 and 2 and negative voltage between compartment 2 and 3. E) Negative voltage between compartment 1 and 2 and negative voltage between compartment 2 and 3. 1
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Name_______________________ Time of Class____________________ 4) All neurons have A) A resting membrane potential. B) A single dendrite. C) A myelinated axon. For Questions 5,10,11,12,13,14,25,27,30 and 33: a 'normal squid giant axon' refers to a squid giant axon with the following inside and outside ion concentrations and relative permeabilites: Ion Intracellular Extracellular Relative permeability K + 400 mM 20 mM 1.0 Na + 50 mM 450 mM 0.01 Cl - 40 mM 560 mM 0.1 It further has one and only one type of voltage-sensitive sodium channel and one and only one type of voltage-sensitive potassium channel and their characteristics are as described by Hodgkin and Huxley. 5) Increasing the sodium concentration 10 fold inside and outside in a normal squid giant axon changes the equilibrium potential for sodium. A) True B) False 6) In a squid giant axon a researcher uses a toxin that reduces the membrane permeability of potassium and increases the membrane permeability for chloride. What is the result of this? A) The resting membrane potential changes towards depolarized potentials. B) The resting membrane potential changes towards hyperpolarized values.
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This note was uploaded on 06/17/2008 for the course BIO 365R taught by Professor Draper during the Fall '08 term at University of Texas.

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exam 1 BIO365R 2006 - Name_ Time of Class_ First Exam- BIO...

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