Questions: Which of the following is NOT true of B lymphocytes? B lymphocytes are activated by helper T cells. B lymphocytes mature in the bone marrow. B lymphocytes respond to specific antigens. B lymphocytes are the same as T cells.

The answer is the fourth one: B lymphocytes are the same as T cells.

Explanation for each option:

1. B lymphocytes are activated by helper T cells. - This is true. Helper T cells play a crucial role in the activation of B lymphocytes.
2. B lymphocytes mature in the bone marrow. - This is true. B lymphocytes, or B cells, mature in the bone marrow.
3. B lymphocytes respond to specific antigens. - This is true. B lymphocytes are responsible for producing antibodies that respond to specific antigens.
4. B lymphocytes are the same as T cells. - This is not true. B lymphocytes and T lymphocytes (T cells) are different types of cells within the immune system with distinct functions and maturation processes.

Summary: The statement "B lymphocytes are the same as T cells" is not true, making it the correct answer to the question.