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D D Question 21 The human immunodeficiency virus (HIV) selectively destroys T, Which of the following would occur: A loss of a specific adaptive immune response due to the lack of clonal expansion O B. loss of a specific adaptive immune response due to the lack of mast cell function OC loss of a specific adaptive immune response due to the loss of MHC I expression O D. loss of a specific adaptive immune response due to the loss of IL-8 secretion O E loss of antigen presenting cell function due to the loss of MHC II expression OF. none of the above would occur Question 22 All of the following represent characteristics of the adaptive immune system EXCEPT: O A reacts slowly to the presence of an infectious agent during the first infection OB. is comprised of lymphocytes OC associated with improved response with repeated exposure of the same pathogen O D. recognition of pathogen associated molecular patterns (PAMP O E can respond to specific molecules of specific pathogens (antigen) OF. associated with the formation of memory cells Question 23 2 pts 2 pts 2 pts Which of the following apply to B cell recognition and response to antigen: OA recognition of antigen displayed by MHC I with secretion of cytotoxins OB recognition of antigen displayed by MHC with secretion of cytokines OC recognition of antigen in the absence of MHC molecules with secretion of antibody in the presence of IL-2 O D. recognition of PAMPs by toll-like receptors with secretion of tumor necrosis factor (TNF) alpha OE none of the above apply