Question

Biological molecules are primarily joined by

• A. Peptide bonds
• B. Ionic bonds
• C. Hydrogen bonds
• D. Covalent bonds

Answer 1

The correct option is D Covalent bonds

Biological molecules, also known as biomolecules, are large structures that are responsible for the catalysis, structure and function of the cell. The molecules (C,H, O, N etc.) within the biomolecules are joined by covalent bond because it is strong bond that maintains structural integrity. The biomolecules will then combine to form a functional cell. The examples include peptide bond, glycosidic bond, phosphodiester bond etc.

A. Peptide bond is a type of covalent bond found in polypeptides. So only proteins will show peptide bonds.

B. Ionic bonds result in formation of cation and anion which could hamper the vital activities within the cells.

C. Hygrogen bonds are weak bonds and they do not confer structural integrity to the molecules.

D. Covalent bonds form the backbone of the structure of biomolecules.

Hence, the correct answer is 'covalent bond'.