Question

Which of the following does NOT correctly describe the process of CD4 T cell activation and proliferation?

a. The CD4 T cell's antigen receptor binds to a class I MHC on the surface of an antigen presenting cell.
b. In order to proliferate and form clones, the CD4 T cell must receive cytokines released by antigen presenting cells or T cells.
c. The CD4 T cell's antigen receptor binds to an antigen displayed on an MHC on the surface of an antigen presenting cell.
d. Co-stimulatory molecules on the surface of the antigen presenting cell bind to specific receptors on the CD4 T cell.

Answer 1

The correct answer is a. The CD4 T cell's antigen receptor binds to a class I MHC on the surface of an antigen presenting cell.

Step-by-step explanation:

The correct answer is a. The CD4 T cell's antigen receptor binds to a class I MHC on the surface of an antigen presenting cell.

The process of CD4 T cell activation and proliferation involves several steps. First, the CD4 T cell's antigen receptor binds to an antigen displayed on an MHC on the surface of an antigen presenting cell.

Next, co-stimulatory molecules on the surface of the antigen presenting cell bind to specific receptors on the CD4 T cell. This interaction provides the second signal needed for full activation of the CD4 T cell.

In order to proliferate and form clones, the CD4 T cell must receive cytokines released by antigen presenting cells or T cells. These cytokines stimulate the CD4 T cell to divide rapidly by mitosis, leading to clonal expansion.