What is antigen antibody reaction?

What are the chief applications of antigen-antibody reactions?

List out the different types of antigen antibody reactions.

ELISA is a technique based on the principles of antigen- antibody reactions. Can this technique be used in the molecular diagosis of a genetic disorder such as Phenylketonuria?

Write in detail about various types of antigen- antibody reactions

Why it is important to study antigen-antibody interaction?

Point out the factors that determine the binding force betwee antigen-antibody reactions.

A protein or polysaccharide molecule that stimulates antibody formation

Antigen - antibody reaction is a specific reaction. Justify your answer.