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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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1. All of the choices are correct.

2. Antitoxins - are derived ...