Which of the following conditions is most likely to result in an increase rate of transcription of the lac operon? O when lactose is present AND the repressor is permanently attached to the operator when lactose is present and there is high levels of glucose when lactose is absent and there are low levels of glucose when lactose is present and there are low levels of glucose

Which of the following conditions is most likely to result in an increase rate of transcription of the lac operon? O when lactose is present AND the repressor is permanently attached to the operator when lactose is present and there is high levels of glucose when lactose is absent and there are low levels of glucose when lactose is present and there are low levels of glucose

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Description: Which of the following conditions is most likely to result in an increaserate of transcription of the lac operon?when lactose is present AND the repressor is permanently attached to theoperatorwhen lactose is present and there is high levels of gluc

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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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 condition(s) is optimal for expression of the lac operon? I. low glucose and formation of CAP-cAMP complex II. high glucose resulting in no cAMP III. no lactose present and a functional repressor IV. presence of lactose binding to a functional repressor
Which of the following statements can be made concerning the role of the lac repressor (Lac R) in conferring negative control of transcription of the lac operon? (mark all the correct answers) All of the other answers are correct. Lac R dimers bind to two distant operator sites to form a Lac tetramer, which is facilitated by DNA looping. More than one operator sequence is required for maximal repression by Lac R. Mutations in Lac R that prevent it from binding allolactose result in repression of the lac operon, even in the presence of lactose. A repression loop formed by the binding of LacR to two operator sequences is required for maximal repression by LacR.
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
If CAP is bound to the Promoter of the Lac Operon and the repressor protein is not bound to the operator, which of the following is true: a.Glucose Levels are low & Lactose is absent b.Glucose is absent & Lactose is present c.cAMP is low & Lactose is Absent d.Glucose and Lactose are Present e.cAMP is low & Lactose is present
What are the effects of the following conditions on Lac operon of bacteria? Do not forget to mention about the role of repressor, activator, RNA polymerase in each case! A) Glucose is absent and lactose is present B) Glucose is present and lactose is present C) Glucose is present and lactose is absent
What are the effects of the following conditions on Lac operon of bacteria? Please do not forget to mention about the role of repressor, activator, RNA polymerase in each case. Glucose is absent and lactose is present Glucose is present and lactose is present Glucose is present and lactose is absent
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
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
Under what conditions would you expect to see high levels of expression of the structural genes in the lac operon? Group of answer choices Lactose is absent and glucose is absent Lactose is absent and glucose is present Lactose is present and glucose is present None of these Lactose is present and glucose is absent
An E. coli cell acquires a mutation in the gene that encodes CAP. The mutation affects the DNA-binding domain of CAP and ablates the ability of CAP to bind to the CAP site. Under which condition will the genes of the lac operon be transcribed at high levels? Glucose absent, lactose absent Glucose absent, lactose present Glucose present, lactose absent Glucose present, lactose present Under any of these conditions, the lac operon will not be transcribed at high levels
In the lac operon system, lactose is considered the ___________, and when the gene lacI is mutated such that the protein it produces cannot bind to lactose (IS mutation), the lac operon is ________. Group of answer choices repressor; never expressed activator; constitutively expressed inducer; never expressed inducer; constitutively expressed structural gene; never expressed