Answer the question on the basis of passage given below:
Living systems are made up of various complex biomolecules like carbohydrates, proteins, nucleic acids, lipids etc. Proteins and carbohydrates are essential constituents of our food. Carbohydrates are primarily produced by plants and form a very large group of naturally occurring organic compounds. Some common examples are cane sugar, glucose, starch etc.
Match List I with List II
| List I | List II |
| A. Carbohydrates | I. Amide linkage |
| B. Proteins | II. Ester linkage |
| C. Nucleic acids | III. Ether linkage |
| D. Lipids | IV. Phosphodiester linkage |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → A-III, B-I, C-IV, D-II
Each class of biomolecule is built from smaller units joined by a characteristic bond:
(A) Carbohydrates — (III) Ether linkage. Monosaccharide units are joined through an oxygen atom (C–O–C); this glycosidic linkage is an ether-type bond.
(B) Proteins — (I) Amide linkage. Amino acids are joined by the peptide bond –CO–NH–, which is an amide formed between –COOH and –\( \ce{NH2} \) groups.
(C) Nucleic acids — (IV) Phosphodiester linkage. Nucleotides are joined through a phosphate group bonded to the 5′ and 3′ carbons of the pentose sugars.
(D) Lipids — (II) Ester linkage. Fats and oils are esters of glycerol with fatty acids.