EBME201 Exam1_2006Key

EBME201 Exam1_2006Key - EBME201, Fall 2006 Exam 1 Name_...

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EBME201, Fall 2006 Exam 1 Name_______________________________ Email_______________________________ Read carefully as many questions have multiple parts . Always show your work and include units if you want credit.
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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)- Amar Req = R1 + R2 = 500 ohms (2 pts: 1 for work, 1 for ans) G = 1/Req = 1/500 S (2Pts: 1 for work, 1 for ans) 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?_________. If the current is 500mA, what is the voltage drop across the pair of resistors? (Include units and show your work)- Amar V=IR => 500 mA * 500 ohms = 250V or 250,000 mV (2 pts: 1 for work, 1 for ans) 3) What is the resistance between point A and point B. What is the conductance? (include units and show your work)- Amar 1/R = 1/R1 + 1/R2 = 20/3 ohms (2 pts: 1 for work, 1 for ans) G = 1 / R = 3 / 2 0 S (2 pts: 1 for work, 1 for ans) 4) Draw a diagram of the phospholipid bilayer that makes up a cell membrane. Include an example of an integral membrane protein and a peripheral membrane protein in your diagram. Label which parts of the membrane are hydrophobic and which parts are hydrophilic. -Amar 5 pts total: 1 for each -correct drawing & labeling of integral protein : spanning entire bilayer -correct drawing & labeling of peripheral protein: 1 side of bilayer only -hydrophobic portion of membrane – inner part of membrane -hydrophilic portion of membrane – outer part of membrane -accurate depiction of the lipid bilayer 400Ω 100Ω 10Ω 20Ω
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5) List 3 types of glial cells.- Amar 6pts total, 2 for each answer - Astrocytes -Oligodendrocytes -Schwann Cells 6) Describe two functions of glial cells.- Amar 4pts total, 2 for each answer, any of the following two were accepted: - Blood brain barrier - Mylination - Nutrient support - structural support - facilitate conduction 7) The main function of the nucleolus is production and maturation of _ ribosomes (2pts) ___- Amar 8) The ___ Golgi Apparatus ( 2pts) __ is a stack of membrane-bound vesicles that are important in packaging macromolecules for transport elsewhere in the cell. Does this packaging need to be selective? Yes or No___ Yes (1 pt) ____ -Amar 9) Membranous organelles such as mitochondria are transported through the nerve by __ fast (2pts) __axonal transport along which cytoskeletal structures? __ microtubules (2 pts) _. Where does the energy for this process come from?__ ATP (2 pts) ______ -Amar 10) The main function of mitochondria is to produce ____ ATP** ________ from ________ ADP** ________. Briefly describe how the mitochondria achieve this? -Amar 6pts total: 2 pts for each -A proton (H+) gradient is generated in the cristae of the mitochondria. -Energy is generated from these protons moving down their concentration gradient -This energy is used to phosphorylate ADP into ATP **Any number of answers were accepted for the fill in the blanks (e.g. energy from food) as long as the explanation below made sense and included ATP from ADP.
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EBME201 Exam1_2006Key - EBME201, Fall 2006 Exam 1 Name_...

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