Question

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multiple choice question
which areas of an antibody determine specificity?
o c
o d
o a
o b

Explanation:

Antibody specificity is determined by the variable regions, which are typically the antigen - binding sites. In the antibody structure diagram, region A (the antigen - binding site, also called the paratope) is responsible for binding to specific antigens, thus determining the antibody's specificity. Regions B, C, and D have other functions (like constant regions for effector functions or structural support), not specificity determination.

Answer:

A. A