The Monomer Subunit of Immunoglobulin Molecules Has All the Following

Question

The monomer subunit of immunoglobulin molecules has all the following except ________.
A)two identical heavy polypeptide chains
B)two identical light polypeptide chains
C)disulfide bonds between polypeptide chains
D)four antigen binding sites
E)a variable and constant region on each polypeptide chain

Accepted Answer

The monomer subunit of immunoglobulin molecules has two identical heavy polypeptide chains and two identical light polypeptide chains, disulfide bonds between polypeptide chains, a variable and constant region on each polypeptide chain. However, it only has two antigen-binding sites per monomer subunit, therefore it does not have four antigen-binding sites.