T-cell response to T-cell-dependent antigens requires
A. typically a protein antigen.
B. binding of T-cell to a site on the antigen.
C. binding of T-cell to a Class II MHC receptor on an antigen-presenting cell.
D. interleukin-1 activating the T helper cell.
E. All of these choices are correct.
Answer: E
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Fill in the blank(s) with the appropriate word(s).
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3.Amphibians and lungfishes both have four limbs and a swim bladder or lungs.
4.All of the groups listed have a backbone and a skull.