Question

The T cell recognizes and interacts with the antigen- MHC II

molecule complex on the membrane of the antigen-presenting cell. An additional co-stimulatory signal is then produced by the antigen-presenting cell, leading to activation of the __ cell

Answer 1

Upon receiving a co-stimulatory signal from an antigen-presenting cell, the T cell that becomes activated is a helper T cell, which, in turn, can activate B cells and cytotoxic T cells.

Step-by-step explanation:

The student's question pertains to the activation of a T cell by an antigen-presenting cell (APC). When an APC presents an antigen bound to an MHC II molecule, it requires a co-stimulatory signal to activate the T cell. Upon receiving this co-stimulatory signal, the T cell will become activated. Specifically, this interaction typically leads to the activation of a helper T cell (CD4+ T cell), which in turn can activate B cells and CD8+ T cells. The CD8+ T cells become cytotoxic T cells that are capable of killing infected cells.