Antibodies

A) play a large role in cell-mediated immunity.
B) are produced by both T and B cells.
C) are composed of four light and four heavy polypeptide chains.
D) are not specific, but act generally.
E) have a variable region that binds to a specific antigenic determinant.

Antigenic Determinant

Specific part of an antigen that stimulates an immune system response by binding to receptors on the surface of lymphocytes; also called epitope.

Cell-mediated Immunity

A type of immunity where T cells directly attack infected or cancerous cells, as opposed to producing antibodies.

Polypeptide Chains

are long chains of amino acids linked by peptide bonds, forming the primary structure of proteins.