(1) NPB 101 Midterm 1 SSI2009

(1) NPB 101 Midterm 1 SSI2009 - NPB 101 Midterm 1(SSI 2009...

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NPB 101 Midterm 1 (SSI 2009) Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 1. Pick the TRUE statement regarding myelination. a. Myelination prevents action potentials from traveling backwards b. In salutatory conduction, action potentials occur in the myelinated region c. Myelination reduces internal resistance in an axon d. If a neuron is demyelinated, it may conduct action potentials slower than normal e. Myelin is a thickening of the plasma membrane of a neuron’s axon ____ 2. Compared to a neuron at rest, a neuron in the rising phase of an action potential… a. … has low permeability to Na + and high permeability to K + b. … has activated K + channels c. … is at equilibrium d. … has changed its threshold to a more depolarized value e. … has activated many voltage-gated Na + channels ___ 3. How do we detect differences between odors? a. We have dedicated olfactory receptors for every single odorant b. One odor activates a certain population of olfactory neurons while another odor activates a different population of olfactory neurons c. The ability to detect differences is based on our previous exposure to and memories of many odors d. different odors induce different action potential frequencies in neurons ____ 4. Pick the TRUE statement a. Tight junctions prevent movement of material from one cell to another b. the head portion of a phospholipid is hydrophobic c. most protein synthesis occurs in the nucleus d. Desmosomes are strong junctions between cells ____ 5. Your patient presents an ability to feel pain in his left hand, but cannot detect gentle touch to the same hand. His ability to contract his left fingers also appears to be nearly absent. He does exhibit normal knee-jerk reflexes in both legs and a normal papillary reflex in response to light. Based on this data, what is the most likely preliminary diagnosis that you can make? a. Right spinal hemisection b. Left thalamus damage c. Right PTO damage d. Left spinal hemisection e. Right somatosensory damage ____ 6. Pick the TRUE statement about biological membranes a. The plasma membrane is asymmetric b. All ion channels are voltage-gated c. Tight junctions help prevent ion flux into or out of the cell d. Phospholipids serve as carriers for molecules
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(1) NPB 101 Midterm 1 SSI2009 - NPB 101 Midterm 1(SSI 2009...

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