Lactose, or milk sugar, is a disaccharide and is composed of one glucose unit and one galactose unit.
Disaccharides are carbohydrate sugars and are composed of two molecules of monosaccharides sugar.
'Di' means two therefore a disaccharide is also called a double sugar. These are also known as biose.
These sugars are formed as a result of a dehydration reaction. A water molecule is removed during each linkage forming a disaccharide.
The linkage between two monosaccharides is glycosidic linkage or acetal bond which holds them together.
These sugars are simple and soluble in water.
The most common examples of disaccharides are sucrose, maltose, and lactose.
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