What is the antibodies made up of (on the molecular level)?

Describe the structure of an antibody

What is the variable region?

What is the hinge region?

What is the constant region?

What is the role of the disulphide bridges in antibodies?

What are the roles of antibodies?

How do antigens agglutinate pathogens?

How do antibodies neutralise toxins?

How do antibodies prevent pathogens binding to human cells?