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Exam%204%20Posted%20Answers - Fourth Exam BISC 307L -...

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Fourth Exam BISC 307L - General Physiology May 2, 2007 1. Answer all 20 of the questions. READ EACH CAREFULLY! 2. Note that questions have different point values. In all, 95 points are possible. 3. You have 120 minutes for this exam. 4. Write your answer within the box provided for each question. Material written outside these spaces will not be graded. 5. WHEN YOU ARE DONE, HAND YOUR EXAM TO YOUR TEACHING ASST. WRITE YOUR NAME ON EACH PAGE Your Name: _______________________________________________________ Please check the Lab Section you are in : Tuesday ± 8:00-10:50 ± 11:30-2:20 ± 3:00-5:50 Wednesday ± 8:00-10:50 ± 2:00-4:50 ± 5:30-8:20 Thursday ± 8:00-10:50 ± 11:30-2:20 ± 3:00-5:50 Friday ± 8:00-10:50 ± 2:00-4:50
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NAME___________________________________ 3 pts. 1. Which one of the following statements about inflammation is false? (a) a. Histamine released from mast cells causes relaxation of smooth muscle in the walls of capillaries, which increases local blood flow. b. Delivery of oxygen and nutrients is aided by increased fluid flow through inflamed areas. Answer in box. c. During inflammation, plasma proteins leak into the extravascular space, increasing the rate at which water leaves capillaries by osmosis. d. Neutrophils accumulate in the extravascular space in inflamed areas. e. Both basophils and mast cells are granulocytes. 3 pts. 2. Which one of the following is not a function served by plasma proteins? (c) a. playing an important role in blood clotting b. lysis of antibody-tagged cells Answer in box. c. transporting O 2 in the blood d. facilitating retention of fluid in capillaries e. transporting certain hormones in the blood f. contributing to the pH buffering capacity of the blood 6 pts. 3. Write a 1, 2, or 3 in each blank to indicate whether these characteristics of acquired immunity apply to: 1) antibody-mediated immunity, 2) cell-mediated immunity, or 3) both. ________ a. involved in rejection of transplanted tissue ANS: a-2, b-1, c-3, d-3, e-2, f-1 ________ b. requires binding of a lymphocyte to a free extracellular antigen ________ c. triggered by binding specific antigens to complementary lymphocyte receptors ________ d. involves formation of memory cells in response to initial exposure to antigen ________ e. primarily defends against virus-infected host cells ________ f. protects primarily against bacterial invaders 4 pts. 4. Indicate whether each of the following statements is true or false by writing the word “True” or “False” in the blank. Do not write T or F. ANS: a-T, b-T, c-T, d-F ________ a. Activated helper T-cells stimulate cytotoxic T-cells by secretion of interleukin-2. ________ b. Plasma membranes of macrophages contain class I MHC proteins, class II MHC proteins, and CD28 proteins. ________ c. Macrophages secrete interleukin-1 to activate helper T-cells. ________ d. CD8-positive cells bind to antigens presented by class II MHC proteins. 2
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NAME___________________________________ 6 pts. 5. If an individual failed to develop a thymus due to a genetic defect, would deficits appear in antibody-mediated immunity, cell-mediated immunity, or both? Briefly explain your answer.
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Exam%204%20Posted%20Answers - Fourth Exam BISC 307L -...

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