If the Disulfide Bonds in IgG Were Broken, How Many

Question

If the disulfide bonds in IgG were broken, how many peptide chains would be set free?
A) 2
B) 4
C) 6
D) 8
E) 1

Accepted Answer

IgG is composed of 4 peptide chains, 2 heavy chains, and 2 light chains. Breaking the disulfide bonds would result in the separation of the heavy and light chains, leaving 4 peptide chains free.