Table of Contents
What does the operon model explain?
operon, genetic regulatory system found in bacteria and their viruses in which genes coding for functionally related proteins are clustered along the DNA. This feature allows protein synthesis to be controlled coordinately in response to the needs of the cell.
Who gave the operon model?
Francois Jacob and Jacques Monod proposed the operon model for the regulation of gene action.
How was lac operon discovered?
Discovering the lac operon, François Jacob. François Jacob talks about bacterial mutants that could not metabolize lactose. Using these mutants, Jacob and Monod figured out how protein production is controlled.
What is operator and operon?
Operator genes contain the code necessary to begin the process of transcribing the DNA message of one or more structural genes into mRNA. Thus, structural genes are linked to an operator gene in a functional unit called an operon.
What’s an operator in an operon?
Operator – a segment of DNA to which a repressor binds. It is classically defined in the lac operon as a segment between the promoter and the genes of the operon.
How are prokaryotic genes expressed according to the Jacob and Monod model?
According to Jacob and Monod model, a group of prokaryotic genes that are transcribed and is under regulation of single promoter is called operon. It consists of structural genes, promoter and additional regulatory sequences.
Who first described the lac operon?
François Jacob talks about bacterial mutants that could not metabolize lactose. Using these mutants, Jacob and Monod figured out how protein production is controlled.
Is operon promoter a gene?
An operon is made up of several structural genes arranged under a common promoter and regulated by a common operator. It is defined as a set of adjacent structural genes, plus the adjacent regulatory signals that affect transcription of the structural genes.
What is operon model class 12?
Complete Answer: – Operons are regions of DNA that are made of a group of related genes. They consist of a promoter region, an operator, and multiple related genes. – Operons are available in prokaryotes (microbes and archaea), however are missing in eukaryotes.