Which of the following is true of HLA (MHC)class I antigens?

Question

Quizplus · Accepted Answer

HLA (MHC) class I antigens are found on all nucleated cells in the body. They present endogenous antigens to cytotoxic T cells, which helps the immune system to identify and eliminate infected or abnormal cells.

Choice A is incorrect because HLA class I antigens present antigens to cytotoxic T cells, not helper T cells.
Choice C is incorrect because HLA class II antigens combine with exogenous antigens and present them to helper T cells. 
Choice D is partially correct, but the more relevant information is that HLA class I antigens are located on chromosome 6, while class II antigens are located on chromosome 9.

Which of the Following Is True of HLA (MHC)class I