1. Eosinophils are involved in the immune response against: A. viruses. B. intracellular bacteria. C. parasitesthat cannot be phagocytized. D. extracellular bacteria. ANS: C 2. Which of the following are components of both innate and adaptive immune responses? A. Immunoglobulins B. T helper cells C. Macrophages D. B cells ANS: C 3. The process by which leukocytes are attracted to a specific area by chemical messengers is called: A. diapedesis. B. degranulation. C. chemotaxis. D. opsonization. ANS: C 4. Which of the following is a characteristic of natural killer cells? A. They mature in the thymus. B. They are smaller than B and T cells. C. They are a type of lymphocyte. D. They are part of the adaptive immune system. ANS: C