Which of the following statements is correct about antigen presentation by class i and class ii mhc molecules? multiple choice an antigen-presenting cell (apc), such as a macrophage, dendritic cell, or b cell, takes in the mhc molecule by receptor-mediated endocytosis or phagocytosis and produces mhc fragments by digestion in the phagolysosome. the class i mhc molecule is presented on the surface together with its endogenous antigen, enabling the host cell to present the antigen to a subset of t cells known as cytotoxic t lymphocytes. class ii mhc molecules bind to fragments that initially come from antigens outside the cell, thus they undergo endogenous antigen processing. class i mhc molecules bind to fragments that initially come from antigens outside the cell, thus they undergo exogenous antigen processing.