What Is the Composition of Lactose?
A) Two Glucose Units $\alpha$

What is the composition of lactose?

A) two glucose units with a $\alpha$ -1,4'-glycoside bond
B) one glucose and one fructose unit with a $\alpha$ -glycosidic bond to the 2'carbon of a fructofuranose ring
C) one galactose and one glucose unit with a $\beta$ -1,4'-glycoside bond
D) repeating unit of glucose units joined in a $\beta$ -1,4'-glycosidic linkage