Final answer:
If the T cell recognizes the antigenic fragment bound to the MHC class II protein on the B cell, the T cell binds to the B cell and cytokines are released from the T cell. The exchange of signals between the B and T cells is called linked recognition.
Step-by-step explanation:
If the T cell recognizes the antigenic fragment bound to the major histocompatibility complex (MHC) class II protein on the B cell, the T cell binds to the B cell and cytokines are released from the T cell. The exchange of signals between the B and T cells is called linked recognition.