First COLOR Exam-365R spring 2010-2 w-ans

First COLOR Exam-365R spring 2010-2 w-ans - Name_ Time of...

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Name_______________________ Time of Class____________________ First Exam- BIO 365R Spring 2010 Semester (Color) There are 36 questions, worth a total of 100 points. There are 8 pages: Make sure you have all 9 pages. DO IT NOW! Questions 1-25 below (worth 3 pts each) are Multiple Choice. Mark your answers for questions 1-25 on the Scantron Questions 26-36 are either short answer or require a calculation. The point value of each question is given next to the question. GOOD LUCK! 1) Which is a description of voltage gated Na channels at rest? a) activation gate is open; inactivation gate is open b) activation gate is open; inactivation gate is closed c) activation gate is closed; inactivation gate is closed d) activation gate is closed; inactivation gate is open e) these channels have no inactivation 2) Which of the answers below is true of voltage sensitive Na channels: a) Blocked by tetraethylammonium b) activation gate is normally closed and opens with depolarizing voltage c) inactivation gate is normally closed and opens with depolarizing voltage d) opening of the activation gate is always slower then opening of K channels. 3) The role of the differential amplifier in the voltage clamp is to: (A) differentiate the internal and external voltages across the cell membrane. (B) record the resting membrane potential. (C) respond to any differences between the membrane potential and the command potential by producing a current. (D) distinguish between capacitative and ionic currents across the cell membrane. 4) The effect of de-myelinating an axon is to; A) increase membrane resistance under the axon where myelin had previously been present thereby speeding up conduction velocity; B) decrease internal resistance under the axon where myelin had previously been present thereby speeding up conduction velocity; C) decrease membrane resistance under the axon where myelin had previously been present thereby slowing down velocity or even blocking its propagation; D) increase membrane resistance under the axon where myelin had previously been present thereby slowing down velocity or even blocking its propagation. 5) The amount of current flow of an ion species across the membrane is determined by: 1) Only by the driving force on the ion. 2) By both the driving force on the ion and its permeability. 3) Only by the membrane permeability for that ion. 4) Only by the degree to which the membrane is de-or hyperpolarized. 1
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Name_______________________ Time of Class____________________ 6) Demyelination in the central nervous system leads to one of the following diseases in humans: a). Multiple Sclerosis. b). Parkinson’s disease. c). Alzheimer’s disease. d). Manic depression. e). None of the above.
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This note was uploaded on 10/25/2010 for the course BIO 365R taught by Professor Draper during the Spring '08 term at University of Texas at Austin.

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First COLOR Exam-365R spring 2010-2 w-ans - Name_ Time of...

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