Lactose is made up of alpha or beta glucose?

Open in App

Solution

Lactose
Lactose is made up of both alpha and beta glucose.
Lactose, sometimes known as milk sugar, is a reducing sugar.
It is a disaccharide made when glucose and galactose combine to form a linkage known as β-1→4 glycosidic linkage.
The systematic name of Lactose is β-D-galactopyranosyl-(1→4)-D-glucose.
Here, glucose might either have the α-pyranose or β-pyranose form, whereas galactose only possesses the β-pyranose form.
As a result, α-lactose and β-lactose correspond to the anomeric form of the glucopyranose ring alone.

Suggest Corrections

Similar questions

Regarding lactose, some statements are given below

A) On hydrolysis, lactose gives β-D-galactose and β-D-glucose

B) In lactose C₁ of β-D-galactose has acetal structure and C₁ of β-D-glucose has hemiacetal structure

C) In lactose molecule, β-D-galactose is a non-reducing unit and β-D-glucose is reducing unit

The correct statements are

Match the List-I and List-II:

List I (Saccharides)	List II (Formed by)
(A) Sucrose	(i) $β$ -D glucose $C_{1} - C_{4}$ glycosidic linkage
(B) Lactose	(ii) $α$ -D glucose, $β$ -D fructose $C_{1} - C_{2}$ glycosidic linkage
(C) Cellulose	(iii) $β$ -D glucose, $β$ -D galactose $C_{1} - C_{4}$ glycosidic linkage

Lactose molecule is made up of β-d (-) galactopyranose and β-d (+) gluco pyraonose. The number of - OH groups present in it are

The enantiomer of $α - D - (+) -$ glucose is ?

Join BYJU'S Learning Program