1. Hypersensitivity is best defined as a(an): A) Disturbance in the immunologic tolerance of self-antigens B) Immunologic reaction of one person to the tissue of another person C) Altered immunologic response to an antigen that results in disease D) Undetectable immune response in the presence of antigens: Answer C) Altered immunologic response to an antigen that results in disease 2. A hypersensitivity reaction that produces an allergic response is called: A) Hemolytic shock B) Anaphylaxis C) Necrotizing vasculitis D) Systemic erythematosus: Answer B) Anaphylaxis 3. The common hay fever allergy is expressed through a reaction that is mediated by which class of immunoglobulins? A) IgE B) IgG C) IgM D) T cells: Answer A) IgE 4. Which type of antibody is involved in type I hypersensitivity reaction? A) IgA B) IgE C) IgG D) IgM: Answer B) IgE 5. Blood transfusion reactions are an example of