Match List - I with List - II.

choose the correct answer from the options given below :

First recall the broad classes of biomolecules discussed in NCERT and JEE syllabus:

• Polysaccharides (large carbohydrates)         
• Proteins (polypeptide chains of amino acids)     
• Components of nucleic acids (nitrogenous bases, sugars, phosphates) 
• Individual amino acids (monomeric units of proteins)

Now examine every entry of List - I and decide to which class it belongs.

Cellulose is an unbranched polymer of $$\beta$$-D-glucose units. Such long chains of sugars are classified as polysaccharides.
Hence A → List - II option (IV) Polysaccharide.

Insulin is a hormone composed of two polypeptide chains (A-chain and B-chain) held together by disulphide bridges. Anything made up of amino-acid chains is placed under proteins.
Hence B → List - II option (I) Protein.

Adenine is a purine nitrogenous base that pairs with thymine in DNA and with uracil in RNA. Nitrogenous bases, pentose sugars and phosphate groups together build nucleic acids; individually they are called components of nucleic acids.
Hence C → List - II option (II) Nucleic-acid component.

Glycine, $$NH_2CH_2COOH$$, is the simplest α-amino acid. Being an individual amino acid, it is not yet a protein but the fundamental monomeric unit of proteins.
Hence D → List - II option (III) Amino acid.

Collecting all the matches:

A → IV, B → I, C → II, D → III

This correspondence is exactly what is listed in Option D.

Final Answer: Option D which is: (A)-(IV), (B)-(I), (C)-(II), (D)-(III)