How do allolactose and lactose differ?
A)They are composed of different sugars.
B)Allolactose has a negative charge, while lactose has a positive charge.
C)The type of linkage holding the two constituent sugars together differs between lactose and allolactose.
D)The order of the sugars is reversed in the two molecules.
E)The constituent sugars are both upside down in lactose and right-side-up in allolactose.

Question

Quizplus · Accepted Answer

Allolactose and lactose differ in the type of glycosidic linkage between the glucose and galactose units. In lactose, the linkage is β-1,4-glycosidic, while in allolactose, which is an isomer of lactose, the linkage is β-1,6-glycosidic. This difference in linkage is crucial for the function of allolactose as an inducer of the lac operon in bacteria.

How Do Allolactose and Lactose Differ