List-I List-II (A) Protein (IV) Peptide bonds

Proteins are macromolecules composed of amino acids. The amino acids are joined together by peptide bonds to form polypeptide chains, which then fold into complex three-dimensional structures to create functional proteins. Therefore, the correct match is (A) - (IV).

(B) Unsaturated fatty acid (I) C=C double bonds

Unsaturated fatty acids are a type of fatty acid that contain one or more carbon-carbon double bonds in their hydrocarbon chain. The presence of these double bonds introduces kinks or bends in the fatty acid structure. Therefore, the correct match is (B) - (I).

(C) Nucleic acid (II) Phosphodiester bond

Nucleic acids, such as DNA and RNA, are polymers composed of nucleotide monomers. The nucleotides are linked together by phosphodiester bonds, which connect the phosphate group of one nucleotide to the sugar group of the adjacent nucleotide in the chain. Therefore, the correct match is (C) - (II).

(D) Polysaccharide (III) Glycosidic bonds

Polysaccharides are large carbohydrate molecules composed of repeating sugar units. The sugar units are joined together by glycosidic bonds, which link the sugar molecules through their hydroxyl groups. Polysaccharides serve as energy storage molecules and structural components in cells. Therefore, the correct match is (D) - (III).

So, based on the given information, the correct matching is: (A) - (IV), (B) - (I), (C) - (II), (D) - (III). This corresponds to option 3.

NEET 2023 Exam Paper - Manipur