Operons & Basics
Process of turning on a gene to make a protein.
Gene expression
The trp operon produces enzymes for this amino acid.
Tryptophan
The lac operon helps bacteria metabolize this sugar.
Lactose
Cluster of genes transcribed together under one promoter.
Operon
The trp operon is an example of this type of regulation.
Negative regulation
Lactose binds to and inactivates this regulatory protein.
Repressor
The DNA site where a repressor binds.
Operator
When tryptophan is present, this protein becomes active.
Repressor
This molecule accumulates when glucose levels are low.
cAMP
Protein that promotes transcription by binding near the promoter.
Activator
When tryptophan levels are low, what happens to transcription?
Increases
cAMP binds to this activator protein.
CAP
Molecules that can turn transcription on or off.
Inducers
What is the regulatory molecule that inactivates transcription in the trp operon?
Tryptophan
Two conditions required for lac operon activation.
Low glucose, lactose present