Explain the importance of covalent bonds in four macromolecules

Covalent bonds is important in four macromolecules such as proteins (polymers of amino acids), nucleic acids (polymers of nucleotides), carbohydrates (polymers of sugars) and lipids (with a variety of modular constituents) because they served as a basic structure of macromolecules.

In addition, the resulting covalent bond is a result of sharing a pair of electrons, one from each atom or molecular units.