B-Lymphocyte Functions in Immunity

Steps:

• B-lymphocytes bind specific antigens using B-cell receptors to initiate response.
• Activated B cells differentiate into plasma cells that secrete antibodies.
• B cells also generate memory B cells for long-term immunity.
• Binding memory cells is not a B-cell function; memory cells derive from B cells but are not targets for binding.

Why B is correct:

• B-lymphocytes bind antigens (1), produce memory cells (3), and secrete antibodies (4), as defined by their role in humoral immunity.

Why the others are wrong:

• A includes 2 (binding memory cells), which B cells do not do.
• C omits 4 (antibody secretion), a key B-cell function.
• D omits 1 (antigen binding) and includes incorrect 2.

Final answer: B