Question 7 0.5 pts In the ABSENCE of lactose, the lac...

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The repressor of the inducible operon (lac operon) will inhibit the transcription by binding to the B. Operator C. Structural genes A. Promoter D. Both A and B E. All A, B & C are correct

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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

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Which of the following does lactose (sugar) bind with? Select all that apply. A) lacl gene product B) RNA polymerase C) lac operator D) lacZ gene product E) lacl promoter Match the following terms with their correct description. In the presence of lactose, this is allowed to transcribe the lacZ gene. What kind of molecule is the inducer? In the absence of lactose, this will bind to the lac operator. 1. Inducer 2. Repressor 3. Protein 4. RNA polymerase 5. disaccharide

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Transcript

00:01 Let's solve the question and here we are discussing about a lack operant.

00:04 So in case of a lack operant we know that it has a promoter, which is a site, you know that promoter is a site where the structural genes, like promoter is a site where rna polymerase is present.

00:24 And this rna polymerase further show the movement towards the structural gene to form a mrn.

00:30 So we know that lack operon, it has a operon.

00:33 It has a operon which is a side where the repressor, where the repressor protein that particularly bind and it will bind to prevent transcription...

Question

Question 7 0.5 pts In the ABSENCE of lactose, the lac repressor binds to the _____, and transcription is blocked. repressor complex terminal operator inducer

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