All the biomolecules (carbohydrates, proteins and nucleic acid) are polymers of some monomeric unit except the lipids.
Carbohydrates are the polyhydroxy ketones or aldehydes. These can be monosaccharides or polysaccharides (polymers of monosaccharides). They are essential for providing energy to the body. Proteins are the polymers of amino acids. They are essential for the body-building and repair of the body.
Nucleic acids are the polymers of nucleotides. A nucleotide is composed of a pentose sugar, nitrogenous base and a phosphate group. There are two types of nucleic acids: DNA and RNA. Nucleic acids contain the genetic material. Lipids are the aggregates and not actually a biomolecule. The structure of lipid is composed of a polar hydrophilic head and a non-polar hydrophobic tail. These are involved in the formation of membranes of the cell.
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