LIFE SCIENCE

Detailed explanation-1: -Lactose is a disaccharide comprised of glucose linked to galactose. Disaccharides are sugars made of two carbohydrate residues. Lactose is therefore not a polysaccharide because the biochemical definition of a polysaccharide states that polysaccharides must possess at least three carbohydrate residues linked together.

Detailed explanation-2: -Lactose, often called milk sugar (Latin, lac, milk), is a disaccharide found in the milk of many mammals, including humans and cows.

Detailed explanation-3: -Sucrose, Lactose, and maltose are disaccharides. Glucose and fructose are monosaccharides. Glycogen, cellulose, and starch are polysaccharides.

Detailed explanation-4: -Lactose is a disaccharide because it is made up of two monosaccharide molecules bonded together with a covalent bond. The monosaccharides that make up lactose are glucose and galactose.