If lactose and glucose are provided in the growth medium of a culture of E. coli, then a. Both lactose and glucose are metabolized at same rate. b. Lactose metabolism is favored. c. CAMP-CAP complex binds CAP site. d. Lac Operon is repressed. e. Adenylate cyclase is activated.

If lactose and glucose are provided in the growth medium of a culture of E. coli, then a. Both lactose and glucose are metabolized at same rate. b. Lactose metabolism is favored. c. CAMP-CAP complex binds CAP site. d. Lac Operon is repressed. e. Adenylate cyclase is activated.

Name: If lactose and glucose are provided in the growth medium of a culture
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Description: If lactose and glucose are provided in the growth medium of a culture of E. coli, then a. Both lactose and glucose are metabolized at same rate. b. Lactose metabolism is favored. c. CAMP-CAP complex binds CAP site. d. Lac Operon is repressed. e. Ade

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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The presence of glucose in the medium will lead to: a) increased cAMP concentrations and reduction of lac operon gene expression b) increased cAMP concentrations and promotion of lac operon gene expression c) reduced cAMP concentrations and reduction of lac operon gene expression d) reduced cAMP concentrations and promotion of lac operon gene expression
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
A mutation occurs in the lac operon operator site such that LacI can no longer bind to the operator site. The effect that this mutation has on the cell is that a. the activity of the lac operon will not be affected. b. the cell can no longer convert lactose to glucose. c. the expression of the lac genes cannot be turned off. d. the expression of the lac genes cannot be turned on.
If β-galactosidase is expressed when lactose is absent, what does this suggest about the lac operon? a) There is a mutation in the repressor protein b) There is a mutation in the catabolite activator protein c) There is a mutation in the promoter region d) There is a mutation in the luxI protein
What is the effect of a mutation in the allosteric site of the Lac Repressor protein? A) The Lac Operon would always be expressed whenever glucose is absent. B) The Lac Operon would never be expressed in any environment. C) The Lac Operon would be regulated normally. D) The Lac Operon would be never be expressed in lactose but would always be expressed in glucose.
What would occur if the repressor of an inducible operon weremutated so it could not bind the operator?(A) irreversible binding of the repressor to the promoter(B) reduced transcription of the operon’s genes(C) buildup of a substrate for the pathway controlled by theoperon(D) continuous transcription of the operon’s genes
The lactose operon is likely to be transcribed when _____. A) there is more glucose in the cell than lactose B) there is glucose but no lactose in the cell C) the cAMP level is high and the lactose level is low D) the cyclic AMP and lactose levels are both high within the cell
Which of the following statements is false?a) A derivative of lactose serves as an inducer of the lac operon.b) Signal transduction provides a mechanism for a cell to sense the conditions of its external environment.c) Quorum sensing allows bacterial cells to sense the density of like cells.d) An example of a two-component regulatory system is the lactoseoperon, which is controlled by a repressor and an activator.e) An ORF is a stretch of DNA that may encode a protein.
Which of the following is true of operons?a. They consist of a coordinated set of genes, all of which are regulated as a single unit.b. They may be inducible or repressible.c. Only bacteria and archaea utilize operons.d. All of the above are true.
Which protein(s) would be bound to the DNA of the lac operon in the presence of both lactose and glucose? A.) both lac repressor protein AND CRP-cAMP B.)neither the lac repressor protein NOR CRP-cAMP C.)the lac repressor protein D.)CRP-cAMP
Gene expression in bacteria is controlled by the operon model. a) Why is the operon model important? b) Why is the trp operon known as a repressible operon?
Which of these BEST DESCRIBE tryptophan in the Trp Operon? A. Acts as a corepressor B. Acts as a coactivator C. Acts as an inducer D. Acts as an enhancer