03 quiz

# 03 quiz - Lesson 3 Quiz Worksheet Print this file and work...

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Lesson 3 Quiz Worksheet Print this file and work on these questions. Then submit your answers in Blackboard’s “Quizzes” section. Note: Once you click on the quiz link on Blackboard and begin entering your answers, you cannot log off until you have completed the quiz. Use the version of the Nernst equation in your notes if needed. Consider the following hypothetical situation. Extracellular mM Intracellular mM Eion A + 2 200 -123 B + 300 30 61.5 C ++ 30 1 45.4 D - 300 30 -61.5 For questions 1 through 8, assume that cells have the above concentration gradients for the ions. 1. (5 points) If the cells were impermeable to all ions, their membrane potential would be a) -123 mV b) -61.5 mV c) 0 mV d) 60.5 mV e) 90.8 mV 2. (5 points) If the cells are permeable only to ________, E m will equal _______ mV. a) A + , 123 b) B + , - 61.5 c) C ++ , 90.8 d) D - , -61.5 e) All the above are correct. 3. (5 points) If the cells were impermeable to all ions, and the extracellular [A + ] increased to 20 mM, a) E m will become more positive. b) E m will become more negative. c) E A will become more positive. d) E A will become more negative. e) Both a and c are correct. f) Both b and d are correct.

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4. (5 points) Based on the values provided in the above table, if the cells are impermeable to all ions and then channels permeable only to A + open, which of the following will
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## This note was uploaded on 06/14/2011 for the course PHYI 202 taught by Professor Shea during the Summer '09 term at UNC.

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03 quiz - Lesson 3 Quiz Worksheet Print this file and work...

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