Type of operon:
Trp operon is a repressible operon
Lac operon is an inducible operon.
Environment:
Trp operon is deactivated when tryptophan is present in the environment.
Lac operon is activated when lactose is present in the environment.
Repressor protein:
Trp operon is activated by tryptophan through bonding to the repressor protein
Lac operon is inactivated by lactose through binding to the repressor protein.
Transcription:
Trp operon -Tryptophan binds to the repressor protein, activating it, thus preventing active transcription of Trp operon.
Lac operon - Lactose binds to the repressor protein, deactivating it, thus allowing for active transcription of Lac operon.
An operon is a unit of DNA found in prokaryotes, containing a cluster of genes under the control of a single promoter and which performs a specific function. Examples of operons are the tryptophan (Trp) and lactose (Lac) operons.
Trp operon is responsible for tryptophan synthesis while Lac operon is responsible for lactose transportation and metabolism.
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