13. A helper T cell response to a protein antigen requires the participation of antigen-presenting cells that express which of the following types of molecules? (A) Class II MHC and co-stimulators (B) Class I MHC and CD4 (C) Class II MHC and CD8 (D) CD4 and co-stimulators (E) Class II MHC and CD4.

13. A helper T cell response to a protein antigen requires the participation of antigen-presenting cells that express which of the following types of molecules?
(A) Class II MHC and co-stimulators
(B) Class I MHC and CD4
(C) Class II MHC and CD8
(D) CD4 and co-stimulators
(E) Class II MHC and CD4.

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15. Which of the following is NOT an example of a checkpoint in lymphocyte development that contributes to the selective maturation of cells with useful antigen receptors? (A) B cell precursors that cannot express TLR die by apoptosis. (B) Developing T cells that fail to express TCR α chains die by apoptosis. (C) Developing T cells that recognize self-major histocompatibility complex (MHC) molecules with high affinity die by apoptosis. (D) Immature B cells that bind to self-antigen with high affinity die by apoptosis. (E) T cell precursors that cannot express TCR β chains die by apoptosis.

13. A helper T cell response to a protein antigen requires the participation of antigen-presenting cells that express which of the following types of molecules?
(A) Class II MHC and co-stimulators
(B) Class I MHC and CD4
(C) Class II MHC and CD8
(D) CD4 and co-stimulators
(E) Class II MHC and CD4.

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