Definitions/Explanation : Splicing & Operator gene
$(1)$ The primary transcripts contain both the exons and introns and are non-functional. Hence it is subjected to a process called splicing where introns are removed and exons are joined in a defined order.
$(2)$ It gives passage to $RNA$ polymerase moving from promotor to structural gene i.e. it control. activity of structural gene.
Functioning of structural genes is controlled by
Definitions/Explanation : Regulatorgene & Promotergene
In Escherichia coli, lac operon is induced by
In Operon concept, the regulator gene regulates chemical reactions in the cell by
Jacob and Monad studied lactose metabolism in E. coli and proposed operon concept, which is applicable for