Which of the following statements is true of the structure of immunoglobulins?
A) Each immunoglobulin molecule is made of two polypeptide chains.
B) Each immunoglobulin molecule is made of four different polypeptide chains.
C) Each immunoglobulin molecule is made of four identical polypeptide chains.
D) Each immunoglobulin molecule is made of two identical light chains and two identical heavy chains.

Question

Quizplus · Accepted Answer

Each immunoglobulin molecule is made of two identical light chains and two identical heavy chains. The light chains are about half the size of the heavy chains and are designated as either kappa or lambda chains. The heavy chains are designated as either mu, delta, gamma, epsilon, or alpha, depending on the class of immunoglobulin. The two chains of each type are held together by disulfide bonds, and the two heavy chains are also held together by a disulfide bond. This structure gives the immunoglobulin molecule a Y-shaped appearance with two identical antigen-binding sites at the tips of the Y.

Which of the Following Statements Is True of the Structure