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Midterm 1 Key 2009

Midterm 1 Key 2009 - Name Bio 125 Midterm 1 fall 09 Put...

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Name:_________________________ - 1 - Bio 125 Midterm 1 fall 09. Put your name on every page (10 pages total). Part 1 _________________________________ 22pts Part 2_________________________________ 44pts Part 3 __________________________________ 6 pts Part 4 __________________________________ 18 pts. Part 5 ___________________________________ 10 pts Total __________________________________ 100pts
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Name:_________________________ - 2 - Part 1: True/ False. If the statement is true, circle true; if the statement is false, circle false. 12 questions 2 points each. 1. (F) The vertebrate nervous system consists of brain and spinal cord. 2. (F) Astrocytes can myelinate more than one axon. 3. (T) At the equilibrium potential for a permeant ion, the flux of the ion down its concentration gradient is equal to the flux of the ion down the electrical gradient across the membrane. 4. (F) The bacterial K+ channel is voltage-gated. 5. (F) Voltage clamp data showed that depolarization leads to a time-dependent inactivation of the potassium current. 6. (F) Neurons in layer IV are the major output neurons of the motor cortex. 7. (F) When current is injected into an axon, an action potential is always evoked before the current can spread any distance from the point of injection. 8. (F) Ion Channels can move ions very fast by using up a lot of ATP. 9. (F) Ligand-gated ion channels establish ionic gradients across the cell membrane. 10. (F) After an ion has reached its equilibrium potential, it will enter and depolarize the neuron. 11. (T) Action potentials can transmit signals over long distances. Part 2: Multiple choice : circle the correct answer.
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Name:_________________________ - 3 - A. are found in both the CNS and PNS B. help keep extracellular ion concentrations stable C. are more numerous than neurons D. all of the above E. none of the above 3. When a neuron's membrane potential is at the "equilibrium potential" for K+
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