BIPN140 2006 MT Key

BIPN140 2006 MT Key - Name PID BIPN140 Midterm GENERAL...

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Name: February 14 2006 BIPN140 Midterm PID: GENERAL INSTRUCTIONS 1. Please write your name on ALL 10 pages. 2. Please answer each question IN THE SPACE ALLOTTED. If you need more space use the back of the page and indicate this in the space allotted. 3. For full credit, state your assumptions and show your calculations. 1) _______/10.0 pts 2) _______/16.5 pts 3) _______/10.5 pts 4) _______/13.0 pts 5) _______/12 pts 6) _______/14 pts TOTAL ___________/76 pts WAIVER : By signing this waiver I give permission for this exam to be left for me to pick up in the library on the 2nd floor of the Center for Molecular Genetics (CMG). I understand that I may only pick up my own exam. I realize that the Department of Biology and its staff cannot take responsibility for exams, which may be stolen or lost, from this area. If I choose not to sign this waiver, I acknowledge that my exam will only be available for pickup 1:30-2:30 p.m., Monday-Friday from room 101 CMG. Signature ________________________________________________ 1
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Name: February 14 2006 BIPN140 Midterm PID: Students are responsible for producing their own original written work, as outlined in the Policy on Integrity of Scholarship published in the UCSD General Catalog. Representing someone else’s work as your own will not be tolerated, and will be investigated according to university policy. A student found to be cheating or plagiarizing will receive a failing grade on the assignment and/or in the entire course, and may also be suspended from UCSD. In addition, the dean of your college will be notified and this occurrence will be permanently placed on your academic file. I, _________________________________, hereby declare that by signing this waiver, all the work submitted is my own original work. I did not receive nor give aid while taking this examination. Signature : __________________________________ 2
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Name: February 14 2006 BIPN140 Midterm PID: Question 1. (10 points total) a) Pretend you are doing an experiment in which you are patching a mammalian neuron in the current clamp configuration. Your neuron is bathed in a solution containing physiological ionic concentrations. Describe qualitatively what happens to the membrane potential (V m ) of that neuron if you increase the extracellular potassium concentration ([K + ]). (1 point) b) Assume that in the previous experiment you increased [K + ] from 2.5 mM (physiological concentration) to 15 mM. If this experiment is being done at a physiological temperature of mammals (i.e. near 37° C), what potential will the membrane reach after you increased [K + ]? The intracellular [K
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BIPN140 2006 MT Key - Name PID BIPN140 Midterm GENERAL...

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