Answer: Bone marrow.
- A Thymus
- B Spleen
- C Bone marrow
- D Lymph nodes
Correct answer: C. Bone marrow
Explanation: B lymphocytes (B cells) are produced and mature in the Bone marrow. T lymphocytes are produced in bone marrow but mature in the Thymus. Both originate from stem cells in bone marrow.
An antibody is Y-shaped, with two identical antigen-binding sites at the tips of the variable regions - each shaped to recognise one specific antigen - while the constant (Fc) region at the base is recognised by immune cells to trigger further responses.
Concept context
Innate and adaptive immunity, B cells, T cells, antibodies, vaccines, and immune disorders. Critical for NEET.