1. Hypersensitivity is best defined as a(an): Answer c. Altered immunologic response to an antigen that results in disease 2. A hypersensitivity reaction that produces an allergic response is called:: - Answer Anaphylaxis 3. The common hay fever allergy is expressed through a reaction that ismediated by which class of immunoglobulins?: Answer IgE 4. Which type of antibody is involved in type I hypersensitivity reaction?: Answer IgE 5. Blood transfusion reactions are an example of:: Answer Alloimmunity 6. During an IgE-mediated hypersensitivity reaction, which leukocyte is activated?: Answer c. Eosinophils 7. During an IgE-mediated hypersensitivity reaction,the degranulation of mastcells is a result of which receptor action?: Answer Histamine bound to H2 8. What characteristic do atopic individuals have that make them geneticallypredisposed to develop allergies?