IMMUNOLOGY

Detailed explanation-1: -Each antibody molecule is essentially identical to the antigen receptor of the B cell that produced it. The basic structure of these proteins consists of two pairs of polypeptide chains (lengths of amino acids linked by peptide bonds) that form a flexible Y shape.

Detailed explanation-2: -B cell receptor refers to an immunoglobulin molecule which serves as a type of transmembrane protein on the surface of B cells while an antibody refers to a blood protein that the B cells produce in response to and counteracting a specific antigen. Thus, this is the main difference between B cell receptor and antibody.

Detailed explanation-3: -An antibody protein is essentially a secreted form of a B cell receptor. (In fact, surface immunoglobulin is another name for the B cell receptor.) Not surprisingly, the same genes encode both the secreted antibodies and the surface immunoglobulins.

Detailed explanation-4: -Each B cell produces a single species of antibody, each with a unique antigen-binding site.

Detailed explanation-5: -The receptor’s binding moiety is composed of a membrane-bound antibody that, like all antibodies, has two identical paratopes that are unique and randomly determined. The BCR for an antigen is a significant sensor that is required for B cell activation, survival, and development.