Membrane Potential Worksheet 2019S-Answers.pdf

Membrane Potential Worksheet 2019S-Answers.pdf - Names and...

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Names and student numbers of everyone in your group: Biology 361 2018W1 1 1. The figure to the right is an artificial cell. There are two compartments (“inside” and “outside” the cell) separated by a non-permeable membrane with a higher concentration of KCl on the inside. A voltage meter has electrodes on each side of the membrane and can measure membrane potential. a. Is there a pathway for ion flow? No. b. Is there a membrane potential? If yes, will it be positive or negative? No. 2. Now imagine that the membrane is permeable to potassium (K + ) but not chloride (Cl - ). a. Will there be a membrane potential? If yes, will it be positive or negative? Yes. Negative. The inside will be more negative than the outside as K+ moves to the outside b. Using ‘+’ and ‘-‘ symbols draw the charge along the membrane on the figure. c. What factors determine the relative distribution of potassium and chloride on each side of the membrane? Concentration. Charge. Permeability. 3. Now imagine we add NaCl (which dissociates into Na + and Cl - ) to the outside of the cell.
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