Lac Operon
The Lac Operon is a classic example of a regulatory system found in bacteria, specifically E. coli, that controls the expression of genes involved in lactose metabolism. It consists of a set of genes, including lacZ, lacY, and lacA, which encode proteins responsible for breaking down lactose into its constituent sugars, glucose, and galactose. The operon is regulated by a repressor protein, LacI, which binds to the operator region of the operon and prevents transcription of the genes in the absence of lactose. When lactose is present, it binds to the repressor protein, causing a conformational change that releases the repressor from the operator and allows transcription to occur. This system allows bacteria to use lactose as an energy source only when it is available, conserving energy when other sources are present.
- What happens to lac repressors in E-coli when lactose is present?
- What is the lac-operon in E.coli bacteria?
- In bacteria, what binds with the repressor to activate the lac operon?
- What causes the lac operon to shut off?
- If the level of lactose is low what happens to the lac operon system?
- How does the a lac operon switch off?
- What is the role of the active repressor?
- What conditions must be present for transcription of the Lac Operon genes? What is the function of a repressor protein if lactose is absent?
- How are lac operons regulated?
- What is the function of the lac-A gene in the lac operon?
- What is the function of the genes in the lac operon?
- What is a gene body?
- What is a regulatory gene?
- Lac operon in e coli is switched on when???
- What is a repressible operon?
- What is the regulatory gene, or the regulatory elements in an operon?
- Is a trp operon an example of positive or negative feedback?
- What is a lac operon?
- How does lactose get into an E. coli cell if the lac operon is turned "off" and the cell is not synthesizing lactose permease?
- Is the lac operon a negative or positive control system?