Question

Antibodies combine with antigens

• A. at variable regions
• B. at constant regions
• C. only if macrophages are present
• D. both (a) and (C)

Answer 1

The correct option is A at variable regions

In the blood, the antigens are specifically and with high affinity bound by antibodies to form an antigen-antibody complex. The antigenic determinant or epitope is recognized by the paratope of an antibody, situated at the variable region of the polypeptide chain.

So, the correct option is 'At variable regions'.