Question

Which of the following is/are cellulose?
$\left(i\right)$ Paper
$\left(ii\right)$ Cotton fibre
$\left(iii\right)$ Chitin
$\left(iv\right)$ Glycogen

• A. $i$ and $ii$
• B. $i$ and $iii$
• C. $i$, $iii$ and $iv$
• D. $iii$ and $iv$
• E. $iii$

Answer 1

Answer: (A)

$i$ and $ii$

Cellulose is a polysaccharide. It is formed by the linkage of beta 1,4 linkage of the glucose unit. It is an important component of the cell wall of the plant. It is used for the production of paper. Cotton fiber grows around the seeds in a form known as boll. It is a pure form of cellulose.

Chitin is the nitrogen-containing polysaccharide. It is an important component of the cell wall of fungi. It is the main constituent of the exoskeleton of the arthropods. It is a long chain polymer of N-acetylglucosamine. It is a modified form of glucose. It is an amide between glucosamine and acetic acid. It has a molecular formula of C${}_8$H${}_{15}$NO${}_6$.

Animal cells store glucose in the form of glycogen. The excess of glucose in the blood is converted to glycogen in the muscle cells. The process of formation of glycogen is known as glycogenesis. During the muscle exercise when extra energy is needed the glycogen is broken down to glucose and channelized into the bloodstream by glycogenolysis.

So, the correct answer is option A.