Perhaps, hair and nails on human body are the basic examples of bio-polymers. But their's genome is difficult to match with any human-made plastics.

Biopolymers are the types of polymers that are produced by living organisms. In other words they are polymeric biomolecules. This includes plants of many types, such as corn and soybeans, but can also come from different types of trees and even some bacteria. Biopolymers can be classified as follows;

Classified according to the monomeric unit used and the structure of the biopolymer formed .

• Polynucleotides i.e. DNA and RNA which are long polymers composed of 13 or more nucleotide monomers.
• Polypeptides which are short polymers of amino acids.
• Polysaccharides, which are linear, bonded polymeric carbohydrate structures.

Depending on their origin they can be classified into.

• Polyesters: Polyhydroxyalkanoates, Polylactic Acid.
• Proteins: Silk, Collagen/Gelatin, Elastin, Resilin, Adhesive, Polyaminoacid, Soy, Zein, Wheat Gluten, Casein, Serum Albumin.
• Polysaccharides (Bacterial): Xanthan, Dextran, Gellan, Levan, Curd Lan, Polygalactosamine, Cellulose.
• Polysaccharides (Fungal): Pollulan, Elsinan, Yeast Glucans.
• Polysaccharides (Plant/Algal): Starch, Cellulose, Agar, Alginate, Carrageenan, Pectin, Konjan, Various Gums.
• Polysaccharides (Animal): Chitin, Hyaluronic Acid.
• Lipids/Surfactants: Acetoglycerides, Waxes, Emulsion.
• Polyphenols: Lignin, Tannin, Humic Acid.
• Specialty Polymers: Shellac, Poly Gamma Glutamic Acid, Natural Rubber, Synthetic Polymers from Natural Fats and Oils.

There are three main classes of biopolymers, classified according to the monomers used and the structure of the biopolymer formed: polynucleotides, polypeptides, and polysaccharides. Polynucleotides, such as RNA and DNA, are long polymers composed of 13 or more nucleotide monomers.

Example of Natural Polymers - Cellulose, Chiton, Carbohydrates, Proteins and Nucleic acids.