NESTER'S MICROBIOLOGY-ACCESS
NESTER'S MICROBIOLOGY-ACCESS
9th Edition
ISBN: 9781260518498
Author: Anderson
Publisher: MCG
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Chapter 17, Problem 3MC
Summary Introduction

Introduction:

An allergic reaction is caused by type 1 hypersensitivity in which IgE antibody is involved. It is a rapid response to immune. Allergic reactions can be prevented through many pathways, but the simplest process is to identify and avoid the particular allergen causing that allergy. As it is not convenient, alternative pathways are used. Desensitization is the process that involves repeated injections of a particular antigen to a person first in diluted form and then slowly increasing the concentration of allergen making the person less sensitive, production of IgG that binds with allergen coating and removing it before IgE binds to it. IgE response is suppressed by cytokines released by activated T cells.

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Delayed-type hypersensitivity reactions in the skina) are characterized by a wheal and flare reaction.b) peak at 4 to 6 hours after exposure to antigen.c) require complement activation.d) show induration because of the influx of sensitized T cells and macrophages.e) depend on activities of the Fc portion of antibodies.
.A table comparing the biological characteristics of the five classes of immunoglobulins is shown below. Answer yes or no in the spaces provided, (You can draw the table in your answer paper) IgE IgD Biological activity a) Activates classical complement pathway b) Present on the membrane of the mature B cells c) Present in secretions d) Induces mast-cell degranulation e) Crosses placenta IgG IgA IgM
7. Which of these cells can activate both B & T lymphocytes? a) Helper T cells b) Plasma cells c) Cytotoxic T cells d) Neutrophils e) Mast cells 8. Which of the following happens when a B cell is activated? a) Inflammation b) The activated B cell differentiates into plasma cells and memory cells c) The B cell will suppress the immune response d) It acts as a phagocyte to engulf antigens e) The activated B cell will release haptens 9. How are T lymphocytes activated? a) Release of histamine during the inflammatory process triggers their activation b) By interferon and antibodies Contact with exposed collagen activates helper T cells d) Through direct contact with a foreign antigen e) Activation of any component of the nonspecific immune response will activate T cells 10. The variable region of an antibody c) ngang naging a) Binds to a specific epitope on an antigen. b) Can bind to several different antigens on the same bacterial cell. c) Binds to the first complement protein (C1). d) Is…
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