The lac operon has which of the following characteristics?O 1) usually requires an activator protein bound to the promoter to be transcribed.O 2) is inactive in the presence of lactose.O 3) is active in the presence of a repressor.O 4) Is a constitutively active operator.O5) is only active in the presence of lactose.

In Eukaryotes all genes are separate and produce individual mRNAs on transcription. However, in…

The lac operon has which of the following characteristics? O 1) usually requires an activator protein bound to the promoter to be transcribed. 2) is inactive in the presence of lactose. 3) is active in the presence of a repressor. 4) Is a constitutively active operator. 5) is only active in the presence of lactose.

The lac operon has which of the following characteristics? O 1) usually requires an activator protein bound to the promoter to be transcribed. 2) is inactive in the presence of lactose. 3) is active in the presence of a repressor. 4) Is a constitutively active operator. 5) is only active in the presence of lactose.

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 11TYU

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In the trp operon, if a mutation occurred in the gene for the repressor so that it could bind to the operator even in the absence of tryptophan____________. a) the inducer cannot bind trpO, so operon gene transcription occurs b) the active repressor cannot bind trpO, so operon gene transcription is attenuated c)the active repressor binds tpO, so operon gene transcription is always repressed d) the repressor binds the corepressor, and operon gene transcription occurs.
Which will be bound to the Lac Operon in an environment with lactose and glucose? A) both repressor and CAP B) repressor only C) CAP only D) neither repressor nor CAP
The lac operon in E. coli bacteria codes for proteins that break down (digest) the disaccharide lactose. Therefore, the lac operon is expressed at its highest levels when there is: A) glucose but no lactose B) lactose and glucose C) lactose but no glucose D) no glucose or lactose
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
If a researcher moves the promoter for the lac operon to the region between the beta galactosidase (lacZ) gene and the permease (lacY) gene, which of the following results would you expect? A) The three genes of the lac operon will be expressed normally. B) The repressor will not be able to bind to the operon. C) The operon will still transcribe the lacZ and lacY genes, but the mRNA will not be translated. D) LacZ will not be transcribed and Beta galactosidase will not be produced.
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?
cAMP binds to cAMP Receptor Protein (CRP), allowing CRP to bind to the promoter of the lac operon a) in positive gene regulation by increasing the transcription when glucose is absent and lactose is present b) in negative gene regulation by decreasing the transcription when glucose is absent and lactose is present c) in positive gene regulation by increasing the transcription when glucose is present and lactose is absent d) in negative gene regulation by decreasing the transcription when glucose is present and lactose is absent
Describe what would happen to the lac operon in a low-lactose environment and in a high lactose environment. a) How will each of these environments affect gene expression? b) What would happen to the repressor in each case? c) How will each of these environments affect RNA polymerase?
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
In the absence of lactose and the lacI repressor gene is mutated such that the repressor protein product can no longer bind to the operator, the structural genes will: [ Select ] ["No longer be expressed", "Be constantly expressed", "Be deleted from the operon"] In the presence of lactose and the lacI repressor gene is mutated such that the repressor protein product can no longer bind to the operator, the structural genes will: [ Select ] ["No longer be expressed", "Be constantly expressed", "Be deleted from the operon"]
The attenuation mechanism that helps block expression of the tryptophan operon requires all of the following, except A) O MRNA transcript of the trp leader sequence B) Oaribosome stalled at the stop codon of the trp leader transcript C) O formation of an attenuator loop D) O low intracellular levels of tryptophan
What is the phenotype of an E. coli strain with a mutation in the lac operator that allows the lac repressor to irreversibly bind the operator? Assume glucose is absent. 1S A) O Transcription of the operon is very high whether lactose is present or not. B) O Transcription of the operon is very low whether lactose is present or not. C) O Transcription of the operon is high in the presence of lactose, and low in its absence. D) O Transcription of the operon is low in the presence of lactose, and high in its absence.