12 Questions
What is the main reason why gene expression regulation is necessary in cells?
Cells have all the DNA but not all genes are expressed
What is the function of repressor proteins in gene expression regulation?
To bind to the DNA to stop RNA polymerase from proceeding
What is the lac operon an example of in prokaryotic cells?
Gene expression regulation
What is the function of an operator in an operon?
A region where regulatory proteins bind
What type of protein regulates gene expression by binding to non-coding sequences on DNA?
Repressor protein
What is the lac operon composed of?
A promoter, an operator, and three genes
What is the primary reason why the lac operon is necessary in E. coli?
To allow the bacteria to digest lactose only when it is present in the gut
What is the role of the repressor protein in the lac operon?
To inhibit the transcription of the lactase gene
What type of gene is the regulatory gene that codes for the repressor protein in the lac operon?
Regulatory gene
What happens to the repressor protein when lactose is present in the bacterial cell?
It is inactivated by the lactose molecule
What is the role of the lac operon in protein synthesis?
To control the transcription of the lactase gene
What is the characteristic of a stem cell?
It is a cell that can become any type of cell
Learn about the importance of gene expression regulation in cells, where not all genes are expressed in every cell, and explore the various mechanisms cells use to control gene expression, including repressor proteins and RNA interference.
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