During transcription, when an inducer is missing, the depressor binds to the operator instead. Then what happens?
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In the presence of high cellular concentrations of tryptophan, tryptophan binds to the repressor, which then binds to the operator. The repressor attaches to the DNA, but transcription proceeds. The repressor binds to tryptophan and then leaves the operator. Tryptophan binds to the operator and prevents transcription.
Sri K.
If an operon is ON, it is because structural gene proteins are being made. TRUE An inducible operon is naturally __ off (repressed) or inactive For an inducible operon, when the repressor is made, it is naturally __ active The repressor, if bound to its sequence, could also be called __ inducer During NO gene expression, the repressor is __ bound to the operator Name the outside influence that binds to the inducible operon repressor corepressor The repressor combined with this outside influence in an inducible operon is __ active
When lac repressor binds the lac operator, the operon is off. How does such binding turn off transcription? The lac repressor protein is a DNA binding protein that only binds to its operator in the presence of lactose The lac repressor protein is an RNA binding protein that only binds to its operator in the absence of lactose The lac repressor stops RNA biding at the promoter site The lac repressor protein is a DNA binding protein that only binds to its operator in the absence of lactose Lac genes are actually constitutively expressed If you have a pure solution of trp repressor protein and a pure solution of trp operator sequences, will they form a complex? (Will they bind to each other?) Yes. In the absence of tryptophan, repressor is able to bind the trp operator No. In the absence of tryptophan, repressor is able to bind the trp operator No. In the absence of tryptophan, repressor is unable to bind the trp operator Yes. In the absence of tryptophan, repressor is unable to bind the trp operator No answers are correct How is the bound lac repressor released when lactose is present? It depends on the concentration of other repressor proteins (for example the tryptophan repressor) Lactose triggers the release of hormones that stimulate metabolism Life requires repressors. When life wants to happen, repressors are activated Equilibrium between bound and unbound lactose and lac repressor Life requires inactive repressor proteins. When life wants to happen, repressors are deactivated In general, which genes are A) constitutively expressed and which genes are B) inducible? A) genes required for the biosynthesis of amino acids from scratch, B) glycolytic genes A) genes required for maltose (a sugar), B) genes that encode electron transport proteins A) genes required for the maintenance of cell wall material, B) genes required for the maintenance of fimbriae and flagella A) glycolytic genes, B) genes required for the biosynthesis of amino acids from scratch All answers are correct
Adi S.
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