HUMAN NUTRITION

NUTRITION

CARBOHYDRATES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Lactose is formed by reaction between:
A
Glucose and Glucose
B
Galactose and Fructose
C
Fructose and Glucose
D
Galactose and Glucose
Explanation: 

Detailed explanation-1: -Lactose is composed of a molecule of galactose joined to a molecule of glucose by a -1, 4-glycosidic linkage . It is a reducing sugar that is found in milk.

Detailed explanation-2: -Bioconversion of Lactose into Glucose–Galactose Syrup by Two-Stage Enzymatic Hydrolysis.

Detailed explanation-3: -Lactose is a disaccharide composed of one molecule each of glucose and galactose.

Detailed explanation-4: -Lactose or milk sugar occurs in the milk of mammals-4-6% in cow’s milk and 5-8% in human milk. It is also a by product in the the manufacture of cheese. Lactose is made from galactose and glucose units. The galactose and glucose units are joined by an acetal oxygen bridge in the beta orientation.

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