A Mutation in the Gene for CD4 Leads to the Production

Multiple Choice

A mutation in the gene for CD4 leads to the production of nonfunctioning CD4 proteins in the plasma membrane of a helper T cell.What role would the helper T cell be unable to perform?

A) response to T-independent antigens
B) lysing tumor cells
C) stimulating a cytotoxic T cell
D) interacting with a class I MHC-antigen complex
E) interacting with a class II MHC-antigen complex