Final answer:
The monomer subunit of immunoglobulin molecules has all the following except `Four antigen sites`
The correct answer is C.
Step-by-step explanation:
Immunoglobulin molecules, also known as antibodies, are proteins produced by the immune system to help fight against foreign substances in the body. Each antibody molecule is made up of two identical light polypeptide chains (A) and two identical heavy polypeptide chains (D). These chains are held together by disulfide bonds (B) between the polypeptide chains.
Antibodies have a variable and constant region on each polypeptide chain (E). The variable region is responsible for binding to specific antigens, which are foreign substances or molecules that trigger an immune response. However, each monomer subunit of an immunoglobulin molecule has only two antigen sites, not four (C).
Therefore, option C is the correct answer as it is the only characteristic not found in the monomer subunit of immunoglobulin molecules.
The answer is C
Your question is incomplete, but most probably the full question was:
The monomer subunit of immunoglobulin molecules has all the following except?
A. Two identical light polypeptide chains
b. Disulfide bonds between polypeptide chains
C. Four antigen sites
D. Two identical heavy polypeptide chains
e. A variable and constant region on each polypeptide chain