Search results
Results from the WOW.Com Content Network
The lac operon is a gene regulation system in bacteria that controls the metabolism of lactose.
Khan Academy. If you're seeing this message, it means we're having trouble loading external resources on our website. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. Explore. Search. Donate. Log in Sign up.
Gene regulation in bacteria involves the control of gene expression to adapt to environmental changes and optimize cellular functions.
Gene regulation controls cell functions by determining which genes are transcribed. This process involves transcription factors, activators, enhancers, repressors, and silencers. Prokaryotes rely on gene regulation for environmental adaptation, while eukaryotes have more complex interactions and a nuclear envelope for added control. Understanding gene expression is crucial for studying ...
An operon is defined as a group of regulatory elements and the genes that the elements control, which are transcribed as one mRNA molecule. The Jacob-Monod group hypothesized that an operon in E. coli, the lac operon, accounts for the lactose processing behavior
For example, the lac operon is an inducible operon that encodes enzymes for metabolism of the sugar lactose. It turns on only when the sugar lactose is present (and other, preferred sugars are absent). The inducer in this case is allolactose, a modified form of lactose.
Khan Academy
The lac operon in E. coli regulates lactose metabolism. It consists of three genes (lacZ, lacY, and lacA) and is controlled by a promoter, operator, and CAP site. Lactose presence triggers allolactose production, which inhibits the lac repressor, allowing transcription.
Operon trp. Visão geral: Regulação gênica em eucariontes. Fatores de transcrição. Regulação da expressão gênica e especialização celular.
The operon is regulated by the presence or absence of lactose. The main regulatory gene that acts on the lac operon is a repressor, which is constitutively produced. In the absence of lactose, the repressor binds to the lac operon operator, where it blocks RNA polymerase from transcribing the lac operon.