Question

Among the following compounds, the incorrect statement is:
A.Cellulose and amylose has 1, 4-glycosidic linkage
B.Maltose and lactose has 1, 4-glycosidic linkage
C.Lactose contains \[\beta\]-D-galactose and $\beta$-D-glucose
D.Sucrose and amylase have 1, 2-glycosidic linkages.

Answer 1

Hint: The cellulose, amylose, maltose and lactose contains 1, 4-glycosidic linkages. Lactose is made using the monomers glucose and galactose. Consider the above criteria and select the incorrect statement.

Complete step by step answer:
A glycosidic linkage is a type of linkage that joins a carbohydrate with any other group. That another group may be a carbohydrate unit of may not be a carbohydrate unit.
Cellulose is an organic compound that is a polysaccharide and consists of long linear chains of beta D glucose connected from carbon number 1 with carbon number 4 of other units. It has 1, 4-glycosidic linkage.
Amylose is also a polysaccharide composed of alpha D glucose that is bonded with each other with 1-4 glycosidic linkages.
Maltose is a disaccharide that is made up of two monosaccharide units, which is formed from glucose. The bonds in maltose are 1, 4-glycosidic linkages.
Lactose sugar is made up of glucose and galactose.
It is made up of\[\beta\]-D-galactose and $\beta$-D-glucose.
Sucrose is a disaccharide that consists of glucose and fructose. It has 1, 2-glycosidic linkages.
So from the above facts it is clear that sucrose has 1, 2-glycosidic linkages but amylase have 1, 4-glycosidic linkages and not 1, 2-glycosidic linkages.

Hence the correct option is D.

Note:
Cellulose is used for making paper. Amylose is one of the components of starch. Starch contains around twenty to thirty percent of amylose. Sucrose is the common sugar that we use in our household. It is also known as cane sugar or invert sugar. Lactose is the natural sugar occurring in the milk, it makes up 2-8 percent of milk. It is also known as milk sugar.