Question

Cellulose is homopolymer of
A. Fructose
B. Mannose
C. Galactose
D. Glucose

Answer 1

1.Cellulose is a polysaccharide.
2.A homopolymer consists of linking of the same monomers.

Complete answer:
Option A: Fructose is a monosaccharide that is found in fruits and vegetables. They have a five-membered carbon ring and the general formula is $C_6H_{12}O_6$. Insulin is a naturally occurring homopolymer of fructose which consists of 3-60 monomers. Cellulose is not a polymer of fructose.
Therefore, this is the incorrect option.

Option B: Mannose is a sugar monomer with the chemical formula $C_6H_{12}O_6$. They can be synthesized from glucose and also can be converted into glucose. They occur as both five carbon rings and six-carbon rings. It doesn’t polymerize to form cellulose. Therefore, this is the incorrect option.
Option C: Galactose is a monosaccharide with the chemical formula $C_6H_{12}O_6$. Combined with glucose, they result in disaccharides called lactose. They are not the monomeric unit of cellulose. Therefore, this is the incorrect option.
Option D: Glucose is the most abundant monosaccharide with the chemical formula $C_6H_{12}O_6$. Important polymers of glucose are glycogen, starch, and cellulose. Cellulose is a homopolymer of glucose which is formed by beta 1-4 linkage of D-glucose units. Humans cannot digest cellulose because they do not have the enzymes to break these bonds. It is the most abundant organic polymer. They are an important component of the plant cell wall. Cellulose is fibrous in nature.

Hence, the correct answer is option (D)

Note: 1.Upon polymerization, the addition of every glucose molecule to the cellulose chain results in the release of one water molecule.
2.Animals like cows and horses digest cellulose with the help of symbiotic bacteria in their intestine.