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study questions - Which of the following statements are...

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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 A. active transport. B. permeability. C. osmosis. D. diffusion. E. dialysis. 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? A. it increases by 10mOsm. B. it increases by 20mOsm. C. it increases by 30mOsm. D. this cannot by determined from the information given. E. none of the above are correct. 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? A. simple diffusion. B. secondary active transport. C. facilitated diffusion. D. primary active transport. E. none of the above are correct. 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. 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? A. sodium ions. B. calcium ions . C. chloride ions. D. potassium ions. E. none of the above are anywhere near a typical value for resting membrane potential.
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8. Poisoning or inhibiting the Na + /K + pump (blocking its activity) would: A. lead to a more negative membrane potential (hyperpolarization). B. increase cellular permeability to Na+. C. increase the energy demand of the cell. D. increase intracellular concentration of K+. E. none of the above would occur. 9. Endocytosis is best illustrated by the process of A. phagocytosis. B. neurotransmission. C. secretory vesicle fusion and the release of contents. D. all of the above are examples of endocytosis. E.
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This note was uploaded on 09/28/2011 for the course SPCM 2360 taught by Professor Stahl during the Fall '11 term at UGA.

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study questions - Which of the following statements are...

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