Question

Which of these is not a macromolecule?
A) Cellulose
B) DNA
C) Glycogen
D) None of the above

Answer 1

Hint: Macromolecule is a molecule which is very large in nature and is composed of macromolecules or polymerization of small units called monomers which combine together forming the macromolecule.

Complete answer:
Macromolecule is a polymer which is composed of several monomers joined together. They have relatively high molecular mass because of their structure. Let us analyze the options to find out the correct option.

Option A: Cellulose is an organic compound which has the formula (C6H10O5)n. It is a polysaccharide which consists of a linear chain of several hundred to many thousands of β(1→4) linked D-glucose units. It is a macromolecule which forms the structural component of the primary cell wall of green plants. The cellulose content of cotton fiber is 90%, that of wood is 40–50%, and that of dried hemp is approximately 57%.Therefore, this is the incorrect option.

Option B: DNA (Deoxyribonucleic acid) is a macromolecule which is formed of two polynucleotide chains that coil around each other forming a double helix. It carries the genetic information of an individual. The two DNA strands are formed from monomers called called nucleotides and each nucleotide is further composed of one of four nitrogen-containing nucleobases (cytosine [C], guanine [G], adenine [A] or thymine [T]), a sugar called deoxyribose, and a phosphate group. Therefore, this is the incorrect option.

Option C: Glycogen is a macromolecule and a polysaccharide of glucose which is also an energy storage form in animals. Glucose units or monomers combine to form this polymer and can be broken down whenever the body requires energy. Therefore, this is the incorrect option.

Option D: Since all the above mentioned options are incorrect and they all are macromolecule. This is the correct option.

Thus, the correct option is (D) None of the above.

Note: The nucleotides are joined to one another in a chain by covalent bonds.Ruminants and termites can digest cellulose with the help of symbiotic microorganisms that live in their guts.