The two types of operons are Inducible and Repressible Operons.

The differences between these two types of operons are significant. In the repressible operon, The product is the regulatory metabolite and starts in the "on" position allowing RNA primase to unzip mRNA. Also the repressor protein only bings to the operator gene in the presence of the regulatory metablite. In the inducible operon, The reactact is the regulartory metabolite and starts in the off position blockig the primase from unzipping mRNA. The repressor protein only binds to the operator gene in the absence of the regulatory metabolite.

Inducible: usually off for protein synthesis but can be turned on Non inducible, or REPRESSIBLE : usually on for protein synthesis but can be turned off Inducible: usually off for protein synthesis but can be turned on Non inducible, or REPRESSIBLE : usually on for protein synthesis but can be turned off

turned off whenever tryptophan is added to the growth medium.

operon are the cluster of genes which are present to each other and having functions in realted manner as one gene is promoter which promote the function of other genes and one is operator which operates the function of structural genes whcih either synthesize certain enzyme or protein.

operon can be inducible or non-inducible and negatie or positive control