When lactose is present lactose induces the activation of the genes in the lac operon by binding the repressor lactose represses the activation of the genes in the lac operon by binding the repressor lactose induces the activation of the genes in the lac operon by binding the operator lactose represses the activation of the genes in the lac operon by binding the operator

When lactose is present lactose induces the activation of the genes in the lac operon by binding the repressor lactose represses the activation of the genes in the lac operon by binding the repressor lactose induces the activation of the genes in the lac operon by binding the operator lactose represses the activation of the genes in the lac operon by binding the operator

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Description: When lactose is presentlactose induces the activation of the genes in the lac operon by binding the repressorlactose represses the activation of the genes in the lac operon by binding the repressorlactose induces the activation of the genes in the la

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter14: Gene Regulation

Section: Chapter Questions

Problem 2TYU

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Similar questions

A mutation that inactivates the repressor gene of the lac operon results in (a) the continuous transcription of the structural genes (b) no transcription of the structural genes (c) the binding of the repressor to the operator (d) no production of RNA polymerase (e) no difference in the rate of transcription
In the lac and trp operons, the repressors are said to be “allosteric molecules” because ___________________________. they undergo a conformational change when they interact with another molecule they stimulate transcription of these operons they affect the production of lactose and tryptophan they can act as a repressor in one operon and an activator in another operon they repress transcription of their respective operons
In the lac operon, the product of structural gene lacZ is capable of ________. producing zinc finger nucleases transporting lactose into the cell repressing the lactose operon forming lactose from lactose precursors cleaving the lactose disaccharide into glucose and galactose
If E. coli bacteria are placed in an environment that contains both glucose and lactose, the regulation of the lac operon will allow which nutrient to be processed first? Both will be processed at the same time. Neither will be processed in this environment. Lactose Glucose Not enough is known about the regulation of the lac operon to know which nutrient will be processed first.
A mutation in the lac I gene that prevents production of the lac repressor choose an answer below: renders the lac operon transcriptionally inactive. leads to constitutive expression of the lac operon. leads to constitutive expression of the trp operon. abolishes the effect of glucose on the transcription of the lac operon. none of the above
High levels of glucose in the environment result in low levels of transcription of the lac operon. The reason for this is ____________________________________________. glucose lowers the levels of the CAP protein, which is necessary to stimulate transcription of the lac operon glucose binds to the Lac Repressor to cause it to bind to the operator site (lac O) glucose raises the levels of cAMP, which binds to the CAP protein to cause transcription repression glucose prevents lactose from binding to the Lac Repressor glucose lowers the levels of cAMP, which is necessary to activate the CAP protein
In the absence of lactose, the genes of the lac operon are: Not transcribed; because there is no lactose to activate the polymerase Not transcribed; because there is no lactose to inhibit the repressor Transcribed; because there is no lactose to inhibit the repressor Transcribed; because there is no lactose to activate the repressor
For an enzyme to be produced from an inducible operon, the repressor must bind to and digest the substrate. the substrate must bind to the repressor and remove it from the operator. the substrate must bind to the operator. the repressor must be bound to the operator.
A mutation at the operator prevents the regulator protein from binding. What effect will this mutation have in the following types of operons? a. Regulator protein is a repressor of a repressible operon. b. Regulator protein is a repressor of an inducible operon.
A mutation in the repressor LacI causes it to lose the ability to bind its effector, allolactose. What will be the effect of this mutation in the presence of allolactose (assume glucose is absent)? a) LacI cannot bind to the lac operator (lacO) and transcription of the lac operon is blockedb) LacI is permanently bound to the lac operator (lacO) and transcription of the lac operon is blocked c) LacI cannot bind to the lac operator (lacO) and transcription of the lac operon increasesd) LacI is permanently bound to the lac operator (lacO) and transcription of the lac operon increases
Assuming that the level of glucose is low, a mutation in the repressor associated with the lac operon of E. coli which prevents binding of the repressor to lactose should result in_____ Constitutive expression of the lac operon genes ito sagot ko Lack of expression or reduced expression of the lac operon genes under all circumstances Expression of the genes only when lactose is present Expression of the genes only when lactose is absent
If tryptophan is presence in the culture media of E.coli then _________. the promoter will be accessed by the RNA polymerase the repressor will bind to the operator the structural genes of the trp operon will be expressed tryptophan will be synthesized