A monomer is a single atom or molecule which is able to join with other monomers to make new substances called polymers.[1] The words come from the Greek language where mono means "one", poly means "many", and meros means "a part". A feature of monomers is that they have two carbon atoms which are joined, called a carbon double bond.[1] The double bond allows the monomer to make the long chains of polymers.[1] There are thousands of different monomers. Examples of monomers include monosaccharide which is simple sugar, glycerol, amino acid and nucleotide.[2] The most made monomer is ethylene.
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