Coenzyme.
Cofactors, mostly metal ions or coenzymes, are inorganic and organic chemicals that assist enzymes during the catalysis of reactions. Coenzymes are non-protein organic molecules that are mostly derivatives of vitamins soluble in water by phosphorylation; they bind apoenzyme to proteins to produce an active holoenzyme. the general term is cofactor, but more specifically, if the cofactor is an organic molecule, it is called a coenzyme. A cofactor is a non-protein chemical compound that is required for the protein's biological activity. These proteins are commonly enzymes, and cofactors can be considered helper molecules that assist in biochemical transformations. A coenzyme is a type of cofactor. It is the loosely bound cofactor to an enzyme. Cofactors are chemical compounds that are bound to proteins. A cofactor is a non-protein chemical compound, while a coenzyme is a non-protein molecule. It is important to understand that, in our body, enzymes are very important. Coenzyme [edit]. A coenzyme is a small, organic, non-protein molecules that carries chemical groups between enzymes. It is the cofactor for the enzyme and does not form a permanent part in the enzyme's structure. Sometimes, they are called cosubstrates and are considered substrates that are loosely bound to the enzyme.
https://en.wikibooks.org/wiki/Structural_Biochemistry/Enzyme/Cofactors http://www.answers.com/Q/What_is_a_non-protein_helper_of_an_enzyme_molecule_called https://en.wikipedia.org/wiki/Cofactor_%28biochemistry%29 http://www.differencebetween.net/science/biology-science/differences-between-cofactor-and-coenzyme/ https://en.wikibooks.org/wiki/Structural_Biochemistry/Enzyme/Cofactors
when a cofactor is an organic molecule what is it called