Answer: Xenograft.
- A Autograft
- B Isograft
- C Xenograft
- D Allograft
Correct answer: C. Xenograft
Explanation: A xenograft is a transplant between different species; it is strongly rejected without heavy immunosuppression.
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.