bipn midterm

bipn midterm - Name BIPN140 Midterm PID GENERAL...

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Unformatted text preview: Name: February 13 2007 BIPN140 Midterm PID: GENERAL INSTRUCTIONS 1. Please write your name on ALL 12 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 pts 2) _______/10 pts 3) _______/14 pts 4) _______/6 pts 5) _______/12 pts 6) _______/17 pts 7) _______/14 pts TOTAL ___________/83 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 Name: February 13 2007 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 Name: February 13 2007 BIPN140 Midterm PID: E quations & Constants Nernst: [ ] ( ) *ln( ) [ ] o ion i ion RT E in Volts zF ion = GHK: [ ] [ ] [ ] ( ) *ln( ) [ ] [ ] [ ] k o Na o Cl i m k i Na i Cl o P K P Na P Cl RT V in Volts zF P K P Na P Cl + +- + +- + + = + + F= 96 485.3415 Q/mol R= 8.314472 J*K-1 *mol-1 z= valence T=temperature (in Kelvins): 273K = 0 O C; 310K = 37 O C (i.e. physiological temperature) Membrane potential in terms of ionic conductances: K K Na Na Cl Cl K Na Cl g E g E g E Vm g g g + + = + + Capacitive and ionic membrane currents: Ohms Law: V=R*I *( ) ion ion m ion I g V E =- * m C m dV I C dt = * Q C V = 1 G R = * [ ( )] m m m ion m ion dV I C g V E dt = +- Onset of current step: Offset of current step: ( remember: e = 2.72 ) ( ) *(1 ) * *(1 ) t t m in m V t V e R I e τ τ-- =- =- ( ) * * * t t m in m V t V e R I e τ τ-- = = Membrane time constant: * m m R C τ = C m = 1 μ F/cm 2 H&H Conductances: 4 (max) * K K g g n = 3 (max) * Na Na g g m h = 3 Name: February 13 2007 BIPN140 Midterm PID: Voltage attenuation and length constant: ( remember: e = 2.72 ) * x x o V...
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This note was uploaded on 07/09/2008 for the course BIPN 140 taught by Professor Unknown during the Winter '06 term at UCSD.

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bipn midterm - Name BIPN140 Midterm PID GENERAL...

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