Question

Which one are polysaccharides?
A. Sucrose.
B. Insulin
C. Starch
D. Cellulose
E. C and D

Answer 1

Hint: We all know that polysaccharides are long chains of sugar composed of monosaccharides that are usually bound by the long chain of glycosidic linkages. The molecular structure of polysaccharides is either branched or linear. To get to the answer we must know about the structure of all the above option.

Complete answer:
Carbohydrates functions as an important source of energy in case of the animal cell whereas in plant cell it forms a structural component.
Let us know about the structure of this option:
A) Sucrose is a common sugar that is a disaccharide that is formed of two monosaccharides of fructose and glucose. They are largely produced by plants naturally.
B) Insulin is a polypeptide hormone that is made of two chains of amino acids which are linked together by a sulphur atom. The peptide bond exists between the monomers.
C) Starch is present as a storehouse of energy in plant tissues. They are also a polysaccharide composed of glucose monomers joined in an alpha 1,4 linkage. The structure of starch is as follows:

D) Cellulose is a polymeric polysaccharide containing only one type of monosaccharides like glucose. They are usually homopolymers. Cellulose is one of the most abundant organic molecules on the globe. The glucose units in cellulose are mainly linked up by beta glycosidic bonds.

From the above information, we get to know that option ‘E’ is the correct answer.

Note: All the carbon compounds that we get from living tissues are called biomolecules. There are only three types of macromolecules - proteins, nucleic acids and polysaccharides that are found in the living systems. Proteins are heteropolymers made of amino acid, nucleic acids are composed of nucleotides. Whereas polysaccharides are found in the cell wall of plants, fungi and also in the exoskeleton of arthropods.