QUESTION 40 In Figure 1, if \"b\" and \"c\" indicate titer of an initial infecti

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QUESTION 40 In Figure 1, if "b" and "c" indicate titer of an initial infection, the arrow at time "D" indicates ?.?. b. a. Time (weeks) The time of exposure to the same antigen as at time "a". The secondary response The primary response Exposure to a new antigen None of the above QUESTION 41 In Figure .1, which letter on the graph indicates the patient's secondary response to an antigen? ?.?. d. Time (weeks) QUESTION 42 The best definition of an antigen is Something foreign in the body A chemical or something foreign that elicits an antibody response and can combine with these antibodies A chemical that combines with antibodies A pathogen. A protein that combines with antibodies QUESTION 43 The best definition of an antibody is A serum protein A protein that inactivates or kills an antigen A protein made in response to an antigen that can combine with that antigen. An immunoglobulin None of the above

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QUESTION 40 In Figure 1, if "b" and "c" indicate titer of an initial infecti

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