1. (a) Binding of inducer protein to repressor protein Gene is switched ON Gene is switched OFF Does NOT affect the gene expression (b) Repressor protein binding at DNA upstream Gene is switched ON Gene is switched OFF Does NOT affect the gene expression (c) Operator is not bound with the repressor Gene is switched ON Gene is switched OFF Does NOT affect the gene expression

1. (a) Binding of inducer protein to repressor protein Gene is switched ON Gene is switched OFF Does NOT affect the gene expression (b) Repressor protein binding at DNA upstream Gene is switched ON Gene is switched OFF Does NOT affect the gene expression (c) Operator is not bound with the repressor Gene is switched ON Gene is switched OFF Does NOT affect the gene expression

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 10TYU: Which of the following is an example of positive control? (a) transcription occurs when a repressor...

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1. (a) Tryptophan-repressor complex binds to operator Gene is switched ON Gene is switched OFF Does NOT affect the gene expression (b) Operator is not bound with the repressor Gene is switched ON Gene is switched OFF Does NOT affect the gene expression
1. (a) Binding of transcription activator protein Gene is switched ON Gene is switched OFF Does NOT affect the gene expression (b) the RNA polymerase binds at the promoter region Gene is switched ON Gene is switched OFF Does NOT affect the gene expression
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
What type of control generally involves binding of a repressor protein to a regulatory DNA sequence? (one or two word answer only, please)
describe the 4 types of suppressors inducer, repressor, promoter, and operator.
What is the effect of an increased Cro concentration on the expression of the gene for the λ repressor? Of an increased concentration of λ repressor on the expression of the Cro gene? Of an increased concentration of λ repressor on the expression of the λ repressor gene?
The binding of the inducer to the repressor causes the repressor to O bind to the operator. stop binding to the operator. bind to the structural genes. stop binding to the structural genes. O bind to other repressors.
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
. 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
When taken up by a cell, which of the following molecules binds to a repressor so that the repressor no longer binds to the operator? a) inducer b) promoter c) repressor d) corepressor
A researcher has just identified a new protein in bacteria that binds DNA near the promoter of a gene and involved in the positive regulation of that gene. This new protein is most likely a(n). activator operator allosteric effector repressor
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