which of the following statements about the A pahge are TRUE, which ones are FALSE? Phage genes are repressed during the lysogenic state. Both cro and A repressor can bind to the same operator sites (OR1 to OR3) but cro has a higher affinity for OR1. Binding of A repressor to the high affinity sites OR1 and OR2 increases expression of cl. Binding of A repressor to the high affinity sites OR1 and OR2 decreses expression of cro. Binding of A repressor to the low affinity site OR3 decreses expression of cl. Lysogeny is istablished during A phage infection when cll is degraded by proteases in E. coli cells that have a high energy metabolism. If the intracellular levels of A repressor were too high, the visus would switch back and forth between lytic and lysogenic sates.

which of the following statements about the A pahge are TRUE, which ones are FALSE? Phage genes are repressed during the lysogenic state. Both cro and A repressor can bind to the same operator sites (OR1 to OR3) but cro has a higher affinity for OR1. Binding of A repressor to the high affinity sites OR1 and OR2 increases expression of cl. Binding of A repressor to the high affinity sites OR1 and OR2 decreses expression of cro. Binding of A repressor to the low affinity site OR3 decreses expression of cl. Lysogeny is istablished during A phage infection when cll is degraded by proteases in E. coli cells that have a high energy metabolism. If the intracellular levels of A repressor were too high, the visus would switch back and forth between lytic and lysogenic sates.

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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The cI gene that encodes the λ repressor has two promotersdesignated PRE and PRM. Which of the following statements isfalse?a. PRE is activated by the cII protein.b. PRE is activated by the λ repressor.c. PRM is turned on after PRE.d. PRM is needed to maintain the lysogenic cycle.
In the above E. coli cell, with high glucose and low lactose levels, what happens at the operator? low lactose causes activation of a repressor protein, allowing it to detach from the operator low lactose causes inactivation of a repressor protein, allowing it to detach from the operator low lactose causes activation of a repressor protein, allowing it to bind to the operator low lactose causes inactivation of a repressor protein, allowing it to bind to the operator all of the above
Which of the following statements is not true of both the LacI and TrpR repressor proteins?a) an allosteric effector molecule changes the DNA-binding activity of the proteinb) transcription is blocked when the repressor protein is bound to the operatorc) the repressor protein is trans-actingd) the allosteric effector causes the repressor to release from the operatore) the operon regulated by the repressor produces the allosteric effector molecule
Suppose you had a bacteriophage λ in which the gene encoding the cro protein had been mutated, so that it had an unusually high affinity for pL - in this phage the first promoter repressed by cro would be pL, not pRM. What effect, if any, would this mutation, and the consequent rapid repression of transcription from pL, have on the outcome of a cell being infected by this mutant bacteriophage? Explain why you would predict that outcome of aninfection by this mutant phage.
In experiments in which rat embryo fibroblasts are transfected with suspected oncogenes, introduction of which of the following genes transform the cells (select one)? A. Myc alone B. H-Ras alone C. E1A alone D. Both Myc and E1A together E. Both Myc and H-Ras together
At 2:00 pm, you measured intracellular arginine at 100M. After addition of 200M of arginine to the cell, you, at 2:45 pm, measured intracellular arginine levels to be still at 100M. The most likely explanation is: Arginine bound to the active site of the repressor protein Arginine bound to the allosteric site of RNA polymerase Arginine was in excess in the cell and acted as an inducer Arginine was in excess in the cell and bound to the operator Arginine bound to the allosteric site of the repressor protein
Two component systems are common in bacteria to regulate the expression of specific genes in response to environmental signals. Which of the following can be said of two component systems? (mark all the answers that apply) An intracellular response regulator is involved in the response. A membrane-bound sensor kinase is typically involved. A membrane transporter is required to transport a molecular signal into the cell, which then serves as an inducer of transcription for an operon. Molecules are pumped out of the cell through one molecular compnent, and transported back in through a second molecular component.
In the absence of tryptophan, the trp repressor is Group of answer choices active and can bind to the operator. active and cannot bind to the operator. inactive and cannot bind to the promoter. inactive and cannot bind to the operator.
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
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