Class II MHC are found on
A) the skin.
B) red blood cells.
C) cytoplasmic membranes of nucleated cells.
D) muscle cells.
E) professional antigen-presenting cells.

Question

Quizplus · Accepted Answer

Class II MHC molecules are mainly found on professional antigen-presenting cells such as dendritic cells, macrophages, and B cells, which play a vital role in presenting antigens to T helper cells. They are also found on certain activated T and B lymphocytes. They are not found on the skin, red blood cells, or muscle cells, and only nucleated cells have cytoplasmic membranes.

Class II MHC Are Found on