Lac operon in E. coli is a classic example of Gene expression occurring at transcription
Explanation:
A lac operon is a type of bacterial operon which is a cluster of co-regulated genes. In order to adapt to environmental changes, the related genes are grouped in an operon. Â
When lactose is absent, the E. coli bacteria group related genes and produce enzymes (lacZ, lacY, lacA) which help in lactose metabolism to encode the unexpressed lactose. Â
Structural genes that specifically code for amino acids are called gene expressions. This takes place at two levels – transcription and translation. Â
Lac operon operation involves promoter, operator, CAP-binding site sequences. The gene group binds with the promoter and is transcribed as a single mRNA.
