SAMPLE2009Exam1

SAMPLE2009Exam1 - BIPN 142 Exam #1 January 28, 2009 Name...

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p. 1 BIPN 142 Exam #1 January 28, 2009 Name (Print): Student No: Exam guidelines 1. This is a closed book, closed note exam. Work by yourself and do not talk with any other students. You have ~50 min (until 9:50 AM) to hand in the exam. 2. You may work in pen or pencil; however, ONLY EXAMS COMPLETED IN NON- ERASEABLE INK WILL BE ELIGIBLE FOR REGRADES . 3. IT IS ABSOLUTELY ESSENTIAL that you print your name on the top of each page. Pages will be separated for grading. 4. You should confine your answers to the space provided. If you must write outside that space, use the back of the same page, and mark clearly that you have done so. Please do not write in this box. PAGE 2: PAGE 3: PAGE 4: TOTAL POINTS: PAGE 5: PAGE 6: PAGE 7: GRADE:
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Name (print):_________________________________ Student Number ______________________ p. 2 PART A: Circle the best answer. Each correct choice is worth 3 points 1. A human brain has approximately _____ neurons. a. 10 9 b. 10 11 c. 10 13 d. 10 15 e. none of these; the number is unknown 2. Which of the following statements about action potentials is false ? a. action potentials can transmit signals over long distances. b. action potentials can amplify small signals. c. action potentials are elicited by hyperpolarization. d. action potentials occur above a threshold. e. action potentials are all-or-none. 3. The transmembrane potential is generated by a. repulsion of positive and negative charges. b. diffusion of ions down a concentration gradient. c. the greater mobility of small ions. d. the selectivity of the membrane to positive charges only. e. All of the above 4. A measured membrane potential of +58 mV would be consistent with _______ inside the cell and _______ outside the cell. a. 100 m M K + ; 10 m M K + b. 10 m M Na + ; 100 m M Na + c. 10 m M Cl ; 100 m M Cl d. 100 m M K + ; 100 m M Na + e. All of the above 5. Studies of the ionic basis of the action potential in squid giant axon found that a. decreasing sodium outside the cell decreases the size of the action potential. b. decreasing sodium outside the cell increases the size of the action potential. c. decreasing potassium outside the cell decreases the size of the action potential. d. decreasing potassium outside the cell increases the size of the action potential. e. sodium has large effects on both the size of the action potential and the resting
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This note was uploaded on 10/16/2011 for the course BIPN 142 taught by Professor Staff during the Spring '08 term at UCSD.

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SAMPLE2009Exam1 - BIPN 142 Exam #1 January 28, 2009 Name...

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