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test 1 -- 2008

test 1 -- 2008 - Examination I VPHY 3100 Elements of...

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Examination I VPHY 3100 Elements of Physiology February 4 th , 2008 1:25 - 2:15 p.m. Multiple Choice (2.5 points each) FOR EACH QUESTION, CHOOSE THE SINGLE BEST ANSWER. 1. Which of the following statements are true concerning the plasma membrane? A. The membrane structure is a glycolipid bilayer. B. The membrane structure is hydrophilic facing the extracellular compartment and hydrophobic on the intracellular side in contact with the cytoplasm. C. larger, polar molecules such as glucose cannot freely diffuse through the membrane. D. All of the above are correct. E. None of the above are correct. 2. A red blood cell will swell or burst when placed in a(n) A. isotonic solution. B. hypotonic solution. C. hypertonic solution. D. saturated solution. E. standard saline solution. 3. Movement of solute molecules from regions of higher to regions of lower concentrations is called 4. You have one liter of a normal saline solution (308mOsm) and you add 10 milli moles of MgCl 2 (.95g). What is the effect on the osmolality of the solution? 5. The inward diffusion of Na + down an existing concentration gradient is used to power the absorption of glucose in which of the following processes? 6. Which of the following statements about membrane transport is true ? A. facilitated diffusion is not a specific process because energy is not expended. B. active transport is not a saturable process because energy is expended. C. facilitated diffusion is unable to transport molecules against a concentration gradient. D. secondary active transport proteins often have ATP binding sites to provide an energy source. 1
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E. none of the above are true. 7. Consider the following equilibrium potentials (mV): E Na+ : +60, E K+ : -90, E Ca2+ : +80, E Cl- : -65. Which ion has an equilibrium potential closest to the resting membrane potential of a typical neuron?
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