Question

Cellulose is a polymer of which of the following?
A. Sucrose
B. Galactose
C. Ribose
D. Glucose

Answer 1

Hint: Cellulose is a polymer which comprises of the monomeric unit of a 6 carbon atom aldohexose sugar. It is found in the cell wall of plants. It is difficult to digest by humans. It is also present in algae.

Complete Answer:
To solve this question, we must know about the structure of cellulose.
- Cellulose is a tough water-insoluble polysaccharide which plays a vital role in keeping the structure of plant cell wall stable.
- Cellulose chains are arranged in microfibrils which make up the plant cell wall. Cellulose has an aldehydic group which is not free. So it is a non reducing sugar. It is a linear polymer which comprises glucose linked together by β 1, 4 glycosidic bonds. Every alternate molecule of glucose in cellulose chains is inverted. The chain is arranged parallel to each other to form microfibrils.
- Sucrose- It is a disaccharide which is composed of glucose and fructose.
- Galactose- It is a monosaccharide which combines with glucose to form lactose.
- Ribose- It is a five carbon open chain monosaccharide which has an aldehyde functional group at one end.

Thus the correct answer is (D).

Note: Cellulose is present in plant cells which helps in maintaining the stiff erect posture of the plant. It is important in the human diet as it keeps the food moving and pushing out of waste from the body. Although it is not digested by humans.