Question

Figure 16.2 illustrates an interaction between a(n)
A) antigen presenting cell and a B lymphocyte. 
B) antigen presenting cell and a T lymphocyte. 
C) NK cell and its target cell. 
D) CTL and its target cell. 
E) antigen presenting cell and a plasma cell.

Accepted Answer

Figure 16.2 shows an interaction between an antigen presenting cell (APC) and a T lymphocyte (also called a T cell), which is indicated by the presence of the T cell receptor (TCR) on the surface of the T cell. The APC is displaying a peptide antigen on its surface in the context of a major histocompatibility complex (MHC) molecule. This interaction is the foundation of cell-mediated immunity and is central to the activation of T cells.