Which of the following statements regarding major histocompatibility proteins (MHCs) is TRUE?
A) Class I MHCs are found on all cells of the body except erythrocytes.
B) Class II MHCs are normally found in the cell membranes of bacteria.
C) Cytotoxic T cells require class II MHCs to recognize foreign antigens.
D) All humans have identical sets of MHC proteins.
E) MHC proteins are the same thing as antibodies.

Question

Quizplus · Accepted Answer

Class I MHCs are found on all cells of the body except erythrocytes. This is because these proteins are responsible for presenting antigens from intracellular pathogens or abnormal self-cells to cytotoxic T cells, which can then eliminate the infected or abnormal cells. Erythrocytes do not have nuclei and therefore do not express class I MHCs.

Which of the Following Statements Regarding Major Histocompatibility Proteins (MHCs)