Which of the following polysaccharide is not entirely composed of glucose subunits?

Which of the following polysaccharide is not entirely composed of glucose subunits? Correct Answer Lactose

Lactose is a disaccharide molecule found in milk. Glycogen, starch and cellulose are all polysaccharides composed entirely of glucose subunits. They have same constitution but different chemical and physical properties.

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The α-D-glucose and β-D-glucose isomers of glucose are known as _______