EBME201_Exam1_2007_KEYA

# EBME201_Exam1_2007_KEYA - EBME201 Fall 2007 Exam 1 Name...

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EBME201, Fall 2007 Exam 1 Name_______________________________ Email_______________________________ Read carefully as many questions have multiple parts . Always show your work and include units if you want credit. No calculators, books, notes, cell phones, ipods, mind reading, etc.

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A B A B 1) What is the resistance between point A and point B. What is the conductance? (include units and show your work) 4pts Total-(HLC) Resistors in series add up R 1 +R 2 =200+300=500 Æ +2pts, -1pt. no units g=1/R total =1/500S Æ +2pts, -1pt no units *If you understood that conductance was the inverse of resistance, but you calculated the resistance wrong (or vice versa) I counted the 1 st wrong and the 2 nd right. 2) In the diagram above, if the current is positive in the direction shown by the arrow, is the voltage higher at point A or B?_ B Æ 1 pt (HLC) _. If the current is 500 µ A, what is the voltage drop across the pair of resistors? (Include units and show your work) 3pts Total- (HLC) V=IR, 500*10^-6amps*500ohms=.25volts +1 for right eqtn +1 for right answer +1 for units 3) What is the resistance between point A and point B. What is the conductance? (include units and show your work) 4pts Total- (HLC) Resistors in parallel add reciprocals and take the inverse 1/R total =1/R 1 +1/R 2 =1/(1/100+1/20)=100/6 Æ +2pts, -1no units g=1/R total =6/100S Æ +2pts, -1 no units *If you understood that conductance was the inverse of resistance, but you calculated the resistance wrong (or vice versa) I counted the 1 st wrong and the 2 nd right. 4) In metal, current is due to the movement of ____ electrons Æ 2pts ____. In solution and in biological tissue, current is due to the movement of __ ions Æ 2pts ______. In either case, positive current is defined as the flow of (positive or negative)__ positive Æ 1pt _____charges. (HLC) 200Ω 300Ω 100Ω 20Ω
5) The phospholipid bilayer forms the outer cell membrane. List four other places in a cell where a phospholipid bilayer is also found. 4pts Total (HLC), +1 pt for each Nuclear membrane, golgi apparatus, mitochondria, endoplamic reticulum, vesicles, peroxisomes, lysosomes, etc. 6) Draw a diagram of a phospholipid bilayer and indicate which parts are hydrophilic and which parts are hydrophobic. 3pts Total-(HLC) +1 pt for correct drawing +1 pt for each correct labeling Hydrophyllic-heads Hydrophobic-tails 7) List 2 different types of glial cells and describe the function of each type. 6 pts Total-(HLC) +1 for each correct cell listed +2 for each correct description 1.) Oligodendrocytes-Myelinate multiple cells in CNS or 2.)Schwann Cells-Myelinate single cells in PNS or 3.)Astrocytes-Provide nutrition/ form blood brain barrier 8) Ribosomes are produced in the ____ __________ [2 points:Thomas] nucleolus 9) In what cellular structure are proteins synthesized that become ion channels in the cell’s membrane? Rough ER Æ 2pts (-1 for leaving off rough) HLC ____ 10) Each strand of mRNA is used to make (one copy or many copies)___ __ of the same protein.

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EBME201_Exam1_2007_KEYA - EBME201 Fall 2007 Exam 1 Name...

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