exam - BIPN 100 Mammalian Physiology I Winter 2005 Final...

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BIPN 100, Mammalian Physiology I. Final Examination Page 1 Winter, 2005. March 15, 2005 P. A. George Fortes Please select the single best answer. 1. What is osmosis? a. diffusion of water to area of lower solute concentration b. diffusion of solutes to area of lower water concentration c. diffusion of solutes to area of lower solute concentration d. diffusion of water to area of higher solute concentration e. diffusion of water to area of higher hydrostatic pressure 2. Osmosis in biological membranes requires: a. Diffusion through the bilayer b. Aquaporins c. Facilitated diffusion d. All of the above e. None of the above Use these choices to answer questions 3 and 4. . a. GLUT1 b. GLUT2 c. GLUT3 d. GLUT4 e. GLUT5 3. Which GLUT transporter is found in the brain? 4. Which GLUT transporter is found in the proximal tubules of the kidney? 5. Which of the following pairs of substrates is co-transported into intestinal and kidney cells? a. Na + /Ca ++ b. Na + /glucose c. H + /K + d. Na + /H + e. Cl - /HC0 3 - 6. Which of the following are true about Na+/K+ pumps? I. They do not contribute to repolarization of the membrane during an action potential. II. They move 3Na+ into the cell and 2K+ out of the cell III. The pump must be phosphorylated to release K+ inside cells IV. They generate electrochemical gradients for secondary active transport V. In the brain, 70% of the energy is used to make ATP for these pumps a. I, II, III, V only b. III, IV, V only c. I, IV, V only d. I and IV only e. I only
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BIPN 100, Mammalian Physiology I. Final Examination Page 2 Winter, 2005. March 15, 2005 P. A. George Fortes 7. If you inject current with a microelectrode into a presynaptic terminal, what would be the membrane potential that would prevent Ca++ influx if the extracellular concentration is 2 mM and the intracellular concentration is 0.2 μ M? (assume Ca-channels are open). a. -61 mV b. -30.5 mV c. +30.5 mV d. +61 mV e. +122 mV 8. The following are true about the resting membrane potential, Vrest, except: a. It depends mostly on the concentration gradient of K+ b. Removing Na+ from the inside of the cell will cause Vrest to become more negative. c. Adding K+ outside of the cell will cause Vrest to become more positive. d. For normal cells, Vrest is between -70 and -90 mV. e. Vrest is kept constant by Na+/K+ pumps, which maintain ion gradients despite ion leaks. 9. Which of the following are true about graded potentials? I. The response is proportional to the stimulus. II. Graded potentials originate in the axon hillock. III. Graded potentials can be either hyperpolarizing or depolarizing. IV. Both hyperpolarizing and depolarizing stimuli give the same magnitude of graded potential. V. Graded potentials decay with distance.
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exam - BIPN 100 Mammalian Physiology I Winter 2005 Final...

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