The peptides presented by MHC class II peptide molecules are
A)from plasma cells.
B)exogenous antigens.
C)endogenous antigens.
D)from T helper cells.

Question

Quizplus · Accepted Answer

MHC class II molecules present exogenously derived peptides, which come from antigens that are external to the cell and have been phagocytosed and processed by antigen-presenting cells. Plasma cells produce antibodies, not peptides. Endogenously derived peptides are presented by MHC class I molecules. T helper cells can recognize and respond to peptides presented by MHC class II molecules, but they do not themselves present peptides on MHC class II molecules.

The Peptides Presented by MHC Class II Peptide Molecules Are