Biology 101 Section 1 Houlihan

Biology 101 Section 1 Houlihan - Biology 101 Section 1...

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Biology 101 Section 1 Houlihan Exam 1 Key 1) When your doctor taps your patellar tendon reflex by tapping the front of your knee with a rubber hammer, what might she be assessing? A. The healthy functioning of your cerebellum B. The health of the nervous tissue between your knee and spinal cord C. The health of the nervous tissue between your knee and your cerebral cortex D. The health of the nervous tissue between your knee and your foot 2) If you experimentally increase the concentration of Na+ outside a cell while maintaining other ion concentrations as they were, what would happen to the cell’s membrane potential? A. The membrane potential would decrease. B. The membrane potential would increase. C. The membrane potential would be unaffected. D. The answer depends on the thermodynamic potential. 3) Which of the following types of ions are most likely to cross the plasma membrane of a resting neuron? A. K + channels B. Na + channels C. Ca ++ channels D. Cl channels 4) If you experimentally increase the concentration of K+ inside a cell while maintaining other ion concentrations as they were, what would happen to the cell’s membrane potential? A. The membrane potential would become more negative. B. The membrane potential would become less negative. C. The membrane potential would remain the same. 5) If the sodium-potassium pump were inactivated by a drug, what would happen to the neuron’s membrane potential? A. immediate loss of resting potential B. immediate loss of action potentials C. slow decrease of resting potential D. no effect
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6) Why do Na + ions enter the cell when voltage-gated Na + channels are opened in neurons? A. because the Na + concentration is much higher outside the cell than it is inside B. because the Na + ions are attracted to the negatively charged interior C. because the Na + ions are actively transported by the sodium-potassium pump into the cell D. both A and B E. both A and C Use the following diagram when answering questions 7–9 : 7) Which letter on the diagram above corresponds to a large efflux of Ca+ ions from the cell? A. A B. B C. C D. D E. None of the above
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9) Which letter(s)on the diagram above corresponds to the action of the sodium-potassium pump and potassium leak channels? A. A B. B C. C D. D E. All of the above. 10) How do myelin sheaths increase the speed with which action potentials are propagated along an axon? A. They increase the permeability of Na + ions in the plasma membrane. B. They amplify the action potential by increasing sodium influx along the entire distance of the neuron. C. They cause action potentials to “jump” down the axon rather than travel in a continuous path along every site on the axon. D. All of the above answers apply.
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Biology 101 Section 1 Houlihan - Biology 101 Section 1...

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