Quiz 10 Posted Answers

Quiz 10 Posted Answers - c. Bacterial infections are more...

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Quiz 10 Covers lectures 29, 30 , 31 Mar 30 (Immunity-Intro) through Apr 3 (Antibody and Receptor Diversity) Posted: Friday, April 3, 1 pm Deadline: Wednesday, April 8, 6 am 1. Which one of the following is not one of the body’s nonspecific defense mechanisms? (c) a. Natural killer cells attacking virus-infected cells. b. Secretion of granzymes by natural killer cells. c. Secretion of antibodies by B-lymphocytes. d. Secretion of tears containing lysozyme. e. Secretion of pyrogens by leukocytes. f. Secretion of histamine by mast cells. 2. In patients with AIDS, circulating neutrophils show an impaired ability to be attracted by chemokines and are observed to undergo apoptosis at an increased rate. Which one of the following is the most direct consequence of these facts? (c) a. Mechanisms of hemostasis are more likely to be defective in AIDS patients compared to healthy persons. b. The ability of dendritic cells to present antigens to lymphocytes is impaired.
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Unformatted text preview: c. Bacterial infections are more likely to cause serious disease in AIDS patients. d. Tissue inflammation is more pronounced in AIDS patients. e. Fewer B-lymphocytes accumulate in damaged tissues. 3. Which one of the following statements about inflammation is false? (b) a. Histamine released from mast cells causes relaxation of smooth muscle in the walls of arterioles, which increases local blood flow. b. In inflamed areas, the reuptake of fluid into capillaries due to the osmotic pressure of plasma proteins is increased. c. Delivery of oxygen and nutrients is aided by increased fluid flow through inflamed areas. d. Neutrophils accumulate in the extravascular space in inflamed areas. 4. Which of the following molecules is incorrectly paired with a source? (e) a. immunoglobulin G : plasma cells b. interferons : virus-infected cells c. interleukin-1 : macrophages d. interleukin-2 : helper T-cells e. lysozyme : cytotoxic T-cells...
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This note was uploaded on 07/15/2009 for the course BISC 220 taught by Professor Mcclure during the Spring '09 term at USC.

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