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What are the common characteristics of all transcription repressor and transcription activator proteins?
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Why is the tryptophan operon turned off in the presence of tryptophan?
Tryptophan binds to and activates the repressor proteins; the repressor proteins, in turn, bind to the operator, preventing transcription.
How is a non-constituative gene turned off?
repressor proteins block the gene physically and prevent transcription from occurring
What are four ways transcription is repressed?
Transcriptional repressors: Proteins that bind to specific DNA sequences near the promoter region of a gene and block the binding of transcription factors and RNA polymerase, preventing transcription initiation. Chromatin remodeling: Repressive chromatin modifications, such as DNA methylation or histone deacetylation, can make the DNA inaccessible to transcription machinery, hindering transcription initiation. Transcriptional interference: Overlapping or nearby transcriptional events can interfere with each other, leading to the repression of one or both transcription processes. RNA-mediated repression: Certain non-coding RNA molecules can bind to mRNA transcripts, inhibiting their translation and subsequently repressing gene expression at the post-transcriptional level.
What is a gene regulation?
The regulator gene produces repressor protein.
Eukaryotic DNA sequences called enhancers have a function similar to the of prokaryotic operons?
Eukaryotic DNA sequences called enhancers have a function similar to the operators of prokaryotic operons. In eukaryotic cells, repressor proteins inhibit transcription by binding to silencers.
Silencers are sites in DNA that?
bind repressor proteins to inhibit the start of transcriptions
Is the lac operon the only example of genes regulated by repressor proteins?
False
What is a transcription factor?
regulatory proteins
What is the product of transcription and translation?
proteins
What do translation and transcription work together and make?
Proteins
What is the ultimate product of transcription and translation?
proteins
Regulatory proteins can exert ther effects when before transcription during transcription after transcription during translation or all of these?
during translation
