All of the following statements about the repressor of the lacoperon of E. coli are true EXCEPT which one?O A. The repressor is the product of a regulatory gene iThe repressor binds to the operator region of the DNA of the lacOB.operon.The repressor is a protein.OC.The repressor interacts with the operator in such a way as toOD.prevent translation of beta-galactosidase.The repressor can combine with lactose to form aOE.complex that will no longer bind to the operator region.QUESTION 32The amino acid which is a precursor of serotonin isHistidineOA.O B. TyrosineO C. GlutamateD. TryptophanO E. none of the above

Name: All of the following statements about the repressor of the lacoperon
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Description: All of the following statements about the repressor of the lacoperon of E. coli are true EXCEPT which one?O A. The repressor is the product of a regulatory gene iThe repressor binds to the operator region of the DNA of the lacOB.operon.The repressor

The lac operon is a clustered group of related genes that are transcribed as a single unit. These…

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Biology

All of the following statements about the repressor of the lac operon of E. coli are true EXCEPT which one? O A. The repressor is the product of a regulatory gene i The repressor binds to the operator region of the DNA of the lac В. operon. The repressor is a protein. OC. The repressor interacts with the operator in such a way as to D. prevent translation of beta-galactosidase. The repressor can combine with lactose to form a OE. complex that will no longer bind to the oper QUESTION 32 The amino acid which is a precursor of serotonin is Histidine OA. B. Tyrosine OC. Glutamate O D. Tryptophan E. none of the above

All of the following statements about the repressor of the lac operon of E. coli are true EXCEPT which one? O A. The repressor is the product of a regulatory gene i The repressor binds to the operator region of the DNA of the lac В. operon. The repressor is a protein. OC. The repressor interacts with the operator in such a way as to D. prevent translation of beta-galactosidase. The repressor can combine with lactose to form a OE. complex that will no longer bind to the oper QUESTION 32 The amino acid which is a precursor of serotonin is Histidine OA. B. Tyrosine OC. Glutamate O D. Tryptophan E. none of the above

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 9TYU: A mutation that inactivates the repressor gene of the lac operon results in (a) the continuous...

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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
Which of the following statements about the lactose operon in E. coli is FALSE? Choose an answer below: It contains the genes that encode the proteins for lactose metabolism. Its transcription is induced when allolactose binds to the lac repressor. It contains a promoter and an operator. It is strongly transcribed when lactose is present in the medium and glucose is absent. none of the above
The regulation of the lac operon in E. coli by Catabolite Activator Protein and glucose is an example of what type of regulation? Group of answer choices Positive inducible Positive repressible Negative inducible Negative repressible Constitutive
The trp operon in E. coli is a negative repressible operon. This implies that... a. The trp operon makes use of an activator and can be turned "on" (i.e., is normally "off") b. The trp operon makes use of an activator and can be turned "off" (i.e., is normally "on) c. The trp operon makes use of a repressor and can be turned "on" (i.e., is normally "off") d. The trp operon makes use of a repressor and can be turned "off" (i.e., is normally "on") e. None of the above
Which of the following is true about the Lac operon? Group of answer choices An operon with a constitutive operator (O^C mutation) will transcribe in the presence of a super repressor It is a positive repressible operon that is influenced mainly by fluctuations in glucose levels Produces a large quantity of tryptophan in order to synthesize lactase It is found in eukaryotes and is responsible for creating an enzyme that breaks down lactose
The lac operon of E. coli controls the expression of genes that code for enzymes involved in lactose metabolism. Mutations to various regions of the lac operon have been discovered which affect both the control of gene expression and the function of the gene products. These mutations include: I - = produces a repressor protein that cannot bind to the operator region IS = produces a repressor protein that cannot be removed from the operator region OC = cannot bind a repressor protein Z - = produces a defective (non-functioning) β-galactosidase enzyme + = wild type Detail the functionality of the lac operon under the following genetic and cellular conditions. You do not need to consider the role of CAP in your analysis. Genes Repressed (yes/no) Constitutive (yes/no) IS O+ Z+ IS OC Z+
The lac operon of E. coli controls the expression of genes that code for enzymes involved in lactose metabolism. Mutations to various regions of the lac operon have been discovered which affect both the control of gene expression and the function of the gene products. These mutations include: I - = produces a repressor protein that cannot bind to the operator region IS = produces a repressor protein that cannot be removed from the operator region OC = cannot bind a repressor protein Z - = produces a defective (non-functioning) β-galactosidase enzyme + = wild type Detail the functionality of the lac operon under the following genetic and cellular conditions. You do not need to consider the role of CAP in your analysis. Genes Repressed (yes/no) Constitutive (yes/no) I+ OC Z+ I+ O+ Z+ (Lactose present) I- O+ Z+
In the tryptophan operon of E. coli, what happens when tryptophan levels get too high? tryptophan is removed from its co-repressor, causing it to detach from the operator tryptophan is removed from its co-repressor, causing it to attach to the operator tryptophan is bound to its co-repressor, causing it to detach from the operator tryptophan is bound to its co-repressor, causing it to attach to the operator all of the above occur at equal rates when tryptophan levels get too high (Option C is the answer for the question above) What effect will the above process have on the tryptophan operon? RNA polymerase will detach from the promoter, initiating transcription RNA polymerase will detach from the promoter, stopping transcription RNA polymerase will attach to the promoter, initiating transcription RNA polymerase will attach to the promoter, stopping transcription all of the above occur at equal rates when tryptophan levels get too high
In the tryptophan operon of E. coli, what happens when tryptophan levels get too high? tryptophan is removed from its co-repressor, causing it to detach from the operator tryptophan is removed from its co-repressor, causing it to attach to the operator tryptophan is bound to its co-repressor, causing it to detach from the operator tryptophan is bound to its co-repressor, causing it to attach to the operator all of the above occur at equal rates when tryptophan levels get too high (Option D is the answer for the question above) What effect will the above process have on the tryptophan operon? RNA polymerase will detach from the promoter, initiating transcription RNA polymerase will detach from the promoter, stopping transcription RNA polymerase will attach to the promoter, initiating transcription RNA polymerase will attach to the promoter, stopping transcription all of the above occur at equal rates when tryptophan levels get too high
In the tryptophan operon of E. coli, what happens when tryptophan levels get too high? tryptophan is removed from its co-repressor, causing it to detach from the operator tryptophan is removed from its co-repressor, causing it to attach to the operator tryptophan is bound to its co-repressor, causing it to detach from the operator tryptophan is bound to its co-repressor, causing it to attach to the operator all of the above occur at equal rates when tryptophan levels get too high What effect will the above process have on the tryptophan operon? RNA polymerase will detach from the promoter, initiating transcription RNA polymerase will detach from the promoter, stopping transcription RNA polymerase will attach to the promoter, initiating transcription RNA polymerase will attach to the promoter, stopping transcription all of the above occur at equal rates when tryptophan levels get too high
Define the following in the context of operons: a. positive control b. give an example of an operon that is under positive control c. negative control d. give an example of an operon that is under negative control e. repressor f. give an example of a repressor molecule g. activator h. give an example of an activator
When iron is scarce, some bacteria can stop synthesis of all enzymes that require iron (Fe3+), such as superoxide dismutase (SOD). Which of the following accurately describes a mechanism for this regulation? Mark all that apply. A. Regulation occurs by an inducible operon B. When absent, the lack of iron causes the repressor to deactivate and block the promoter region for these genes C. Regulation occurs by a repressible operon D. When present, iron binds and activates the repressor protein