Non-protein part, which is organic in nature and detachable, is called:

Explanation

A coenzyme is defined as a non-protein organic molecule that associates with an enzyme and assists in catalyzing biochemical reactions. It is characterized by its detachable nature, allowing it to dissociate from the enzyme after the reaction. In contrast, an activator is typically an inorganic cofactor that enhances activity but is not organic or detachable. A cofactor is a more general term that includes various types of molecules necessary for enzyme function, but it does not specify the organic and detachable characteristics of coenzymes. Lastly, a prosthetic group is an organic non-protein molecule that is permanently attached to an enzyme, making it essential for the enzyme's activity, thus not fitting the description of a detachable entity.