Question

Antigenic determinants are

• A. Large and complex molecules that are different from those of an organism/host
• B. Proteins or carbohydrates
• C. Recognisable sites over antigens
• D. Specific products of pathogen

Answer 1

Answer: (C)

Recognisable sites over antigens

An epitope, also known as antigenic determinant, is the part of an antigen that is recognized by the immune system, specifically by antibodies, B cells, or T cells. The part of an antibody that binds to the epitope is called a paratope. These epitopes interact with the paratope based on the 3-D surface features and shape or tertiary structure of the antigen.

So, the correct answer is 'Recognisable sites over antigens'.