Two $\alpha$ $\beta$ Heterodimers of the Insulin Receptor Are Held Together by ____

Multiple Choice

Two $\alpha$$\beta$ heterodimers of the insulin receptor are held together by ____ between the _______.

A) ionic bonds, $\alpha$ chains
B) ionic bonds, $\beta$ chains
C) disulfide bonds, $\alpha$ chains
D) disulfide bonds, $\beta$ chains
E) disulfide bonds, $\alpha$ chain of one heterodimer and the  chain of the other