High levels of IgE stimulate overactivation of immune system. A True B False
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An individual is born that lacks the genes necessary to produce the high affinity Fc epsilon RI receptor (FcεRI). Which one of the following statements about this individual is false? A. This individual would have increased levels of IgE in their bloodstream compared to a normal person. B. This individual would be able to experience graft vs. host disease following a bone marrow transplant. C. This individual would be able to experience a positive reaction in the tuberculin test. D. This individual would not make normal levels of IgE following exposure to an inhaled allergen. E. This individual would not be able to experience a wheal and flare reaction following a mosquito bite.
Adi S.
88. Which of the following is false concerning IgE. A. Basophils and mast cells have receptors for Fc of IgE. B. IgE & all other (Ig) antibodies have 4 identical chains held together by disulfide bonds. C. After sensitization (production of antibody and binding to mast cell and basophils), subsequent exposure to the antigen causes cross-linking and release of vasoactive mediators responsible for immediate hypersensitivity (hay fever, asthma, bee sting). D. Eosinophilia and IgE is often associated with certain worm infections. E. Worms coated with IgE may then be attacked by ADCC, because eosinophils have receptors for Fc of IgE and will then release lytic enzymes.
Sri K.
In an allergic reaction (a) the body is immunodeficient (b) an allergen binds with IgE (c) T helper cells release histamine (d) allergen stimulates graft rejection (e) mast cells are deactivated
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