Two αβ Heterodimers of the Insulin Receptor Are Held Together

Two αβ heterodimers of the insulin receptor are held together by ____ between the _______.

A) ionic bonds, α chains
B) ionic bonds, β chains
C) disulfide bonds, α chains
D) disulfide bonds, β chains
E) disulfide bonds, α chain of one heterodimer and the β chain of the other