For each characteristic, indicate which type of immune response is involved RE effective against intracellular parasites, like viruses, but cannot respond to extracellular antigen effector cells bind to a target cell that presents antigen paired with class I major histocompatibility complex (MHC) proteins 1. antibody-mediated (humoral) give memory response to succeeding antigen exposures 2. cell-mediated T-helpers activate the functiona response 3. true for both types may neutralize toxins and block viral binding sites requires B lymphocytes, which, when stimulated differentiate into plasma cells and memory cells.

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