The exact pa of the antigen that reacts with the immune system is called as -: (A) Clone, (B) Epitope, (C) Idiotope, (D) Effector
Answer is B. An epitope, also known as antigenic determinant, is the pa of an antigen that is recognized by the immune system, specifically by antibodies, B cells, or T cells. Ref: Ananthanarayan & Panikers textbook of microbiology 9th edition pg:88