kiranmayi
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Antigens processed by the exogenous antigen presentation pathway are presented in association with which of following?
A. Fc receptors
B. IgG heavy chains
C. MHC class I molecules
D. MHC class II molecules
E. T cell receptor (TCR)
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| dxtxpx
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choice C
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| asmi
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D..
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| kiranmayi
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The correct answer is D. When pathogenic organisms are phagocytized and degraded in the exogenous antigen presentation pathway, the antigenic molecules are presented on the surface of the antigen-presenting cell by MHC class II molecules to a CD4+ T lymphocyte with a specific TCR for the specific antigenic epitope.
In the endogenous antigen presentation pathway (eg, a virus infecting a cell), the cell would display epitopes from the virus in association with class I molecules (choice C) to the CD8+ cytotoxic T cell.
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| dxtxpx
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thanks
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