B-Lymphocytes in Hybridoma Formation

Steps:

• Monoclonal antibody production starts with immunization to activate immune cells.
• B-lymphocytes, which produce specific antibodies, are isolated from the spleen.
• These B-cells are fused with myeloma cells to form hybridomas.
• X in the diagram labels the antibody-producing cells at this fusion stage.

Why B is correct:

• B-lymphocytes are plasma cell precursors that secrete monoclonal antibodies, central to hybridoma technology as defined in immunology.

Why the others are wrong:

• A: T-lymphocytes assist immunity but do not produce antibodies.
• C: Antigens stimulate B-cell response but are not cellular components in fusion.
• D: Antibodies are the end products, not the cells represented by X.

Final answer: B