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    T cell response to T-cell-dependent antigen reqiures:
    a) typically a protein antigen
    b) binding of T cell to a Class II MHC receptor on a
    c) binding of T cell to a site on the antigen
    d) interleukin-1 activating the T helper cell
    e) all of the choices are correct

    a) contain modified bacterial exotoxin molecules
    b) are always genetically engineered
    c) contain select antigenic components of a pathogen
    rather than whole cells or viruses
    d) confer passive immunity

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    Solution Preview

    1. All of the choices are correct.

    2. Antitoxins - are derived ...