A nonfunctional CD4 protein on a helper T cell would result in the helper T cell being unable to ________.
A) respond to circulating viral antigens
B) lyse tumour cells
C) stimulate a cytotoxic T cell
D) interact with a class II MHC-antigen complex

Question

Quizplus · Accepted Answer

The CD4 protein is responsible for recognizing and interacting with class II MHC-antigen complexes on antigen-presenting cells. Without a functional CD4 protein, the helper T cell would be unable to recognize and respond to antigen-presenting cells, making choice D the correct answer.

A Nonfunctional CD4 Protein on a Helper T Cell Would