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Human Biology Spring 2006 Quiz 6 - 20 points Name: Part I. Multiple choice. Write your answer next to the question number. 6 points ____ 1. _________ are barriers to pathogens at body surfaces. 1. Intact skin and mucous membranes 2. tears, saliva, and gastric fluid 3. resident bacteria 4. all are correct ____ 2. _____________ are molecules that lymphocytes recognize as foreign and that elicit an immune response. 1. interleukins 2. antibodies 3. antigens 4. histamines ____ 3. ____________ are molecules released by mast cells during non-specific defense. <use answers from 2. above> ____ 4. _____________ are molecules released by some cells, like T-helper cells, that communicate with other cells. <use answers from 2. above> ____ 5. The most important antigens are __________. 1. nucleotides 2. steroids 3. proteins 4. triglycerides ____ 6. The development of a secondary immune response is based on populations of __________ 1. effector cytotoxic T cells 2. memory cells 3. effector B cells 4. macrophages Part II. Part III. For each of the following numbers on the diagram below, give the name of the cell or structure. 7 points. 1. 2. 3. 4. 5. 6. 7.