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When lactose is present in bacterial cell's it prevents the blocking effect of the repress or protein and allows the transcription of lactose metabolizing gene true or false?
false
What does the lac operon lactose bind to?
The lac operon is a group of genes involved in metabolizing lactose. The protein Lac repressor binds to the operator site in the absence of lactose, blocking gene expression. When lactose is present, it binds to the Lac repressor, causing it to release from the operator and allowing transcription of the genes involved in lactose metabolism.
A protein that binds to an operator and inhibits transcription?
A repressor protein binds to the operator region of DNA to inhibit the binding of RNA polymerase, blocking transcription of the gene. This mechanism is common in prokaryotic organisms to regulate gene expression by preventing transcription of specific genes when they are not needed.
Examples of a molecule in your body that can affect transcription factors?
A repressor, which works by binding to the operator and blocking the attachment of RNA polymerase to the promoter.
Give an examples of a molecule in your body that can affect transcription factors?
A repressor, which works by binding to the operator and blocking the attachment of RNA polymerase to the promoter
What can inhibit transcription by blocking the binding of positively acting transcription factors to the DNA?
The binding of negatively acting transcription factors, chromatin remodeling complexes, DNA methylation, or histone deacetylation can inhibit transcription by preventing the binding of positively acting transcription factors to the DNA.
What is a repressible operon?
A repressible operon is a type of operon in bacteria where gene expression is usually active but can be turned off when a specific corepressor molecule binds to the repressor protein. This binding causes the repressor to bind to the operator region of the operon, blocking transcription and thus shutting down gene expression. An example of a repressible operon is the trp operon in E. coli, which is involved in tryptophan biosynthesis.
What molecule causes transcription of an operon?
The molecule that typically causes transcription of an operon is an inducer, which can either activate or repress the operon by binding to a regulatory protein. In the case of an inducible operon like the lac operon in E. coli, lactose acts as an inducer by binding to the repressor protein and preventing it from blocking transcription.
What prevents e coli from expressing the lac genes in its DNA all of the time?
The lac genes in E. coli are regulated by the lac operon, which is controlled by a repressor protein. The repressor binds to the operator region of the DNA, blocking the transcription of the lac genes. When lactose is present, it binds to the repressor, causing a conformational change that releases the repressor from the operator, allowing for the expression of the lac genes.
What happens to the repressor protein when it's not functioning?
When the repressor protein in not functioning then the gene that that protein was blocking will be "turned on". BTW its not right to cheat, even on study guides ;)
What gene specifies a protein that binds to an operatr and physically blocks rna polymerase from binding to a promoter site?
The gene that specifies a protein known as a repressor can bind to the operator region in the DNA, physically blocking RNA polymerase from binding to the promoter site. This mechanism helps regulate gene expression by preventing transcription of the gene.
A lac repressor turns ff the lac genes by binding to?
A lac repressor turns off the lac genes by binding to the operator
