After activation, what is the fate of a lymphocyte?

• A. It remains inactive forever
• B. It can differentiate into effector or memory cells
• C. It will immediately die
• D. It will clone into multiple B cells only

Answer: (B)

When a lymphocyte is activated, it undergoes a critical process that leads to its differentiation into effector cells or memory cells. This is a vital part of the immune response. Effector cells are responsible for carrying out the immediate response against pathogens, such as plasma cells that produce antibodies in the case of B lymphocytes or cytotoxic T cells that directly kill infected cells for T lymphocytes.

Memory cells, on the other hand, play a crucial role in long-term immunity. They allow the immune system to respond more quickly and effectively upon re-exposure to the same antigen, providing the body with an immunological memory. This differentiation into effector and memory cells ensures that the body has both an immediate defense mechanism and a sustained protective capability against future infections.

The other options do not accurately describe the fate of a lymphocyte after activation. Lymphocytes do not remain inactive forever, nor do they die immediately after activation. While B cells can indeed clone to produce more B cells, they also differentiate into other types of cells, making the option emphasizing only B cell cloning incomplete.