Question

what is the difference between b-cell lymphocytes and t-cell lymphocytes?
○ b cells regulate blood ph, and t cells regulate body temperature.
○ b cells are produced in the thymus, and t cells are produced in the bone marrow.
○ b cells engulf bacteria, and t cells carry bacteria to the lymph nodes.
○ b cells produce antibodies, and t cells destroy infected cells.

Explanation:

• Analyze each option:
• Option 1: B - cells and T - cells are part of the immune system, not involved in regulating blood pH or body temperature. So this option is incorrect.
• Option 2: B - cells are produced in the bone marrow, and T - cells mature in the thymus (but also start in the bone marrow). So this option has the production sites reversed and is incorrect.
• Option 3: Phagocytes (like macrophages) engulf bacteria, not B - cells. T - cells do not carry bacteria to lymph nodes in this way. So this option is incorrect.
• Option 4: B - cells are responsible for humoral immunity and produce antibodies. T - cells are involved in cell - mediated immunity and can destroy infected cells. This option correctly describes the main functions of B - cells and T - cells.

Answer:

D. B cells produce antibodies, and T cells destroy infected cells.