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

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

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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Similar questions

A constitutive mutation in the lac operon may be of several types. [Note that constitutive means that the structural genes are always expressed, even if lactose is absent.] Name two types of constitutive mutations. Group of answer choices LacY- and LacI- LacOc and LacZ- LacZ- and LacI- LacY- and LacA- LacI- and LacOc
Regarding the trp operon: when levels of tryptophan are low, the ___ hairpin forms, resulting in _____ of transcription. Group of answer choices 2-3; termination 3-4; termination 3-4; continuation 2-3; continuation
In addition to observing similarities to the lac operon, you also notice that this gene is regulated via attenuation, similar to the trp operon. Based on this similarity to this model operon, you could state that ___________. Group of answer choices If a terminator loop forms in the DNA, the expression of the structural genes is halted. The formation of the terminator hairpin followed by a series of Uracil (UUUUUUU) functions similar to Rho-Independent termination to result in the stopping of transcription. The transcription of a leader sequence affects the translation of the structural genes. Never mind – all of these statements are true! Attenuation will be the primary means of transcriptional regulation, with a repressor used as a back up option.
Lac operon regulation under allolactose functions under____________ control; trp operon regulation under tryptophan functions under____________ control. Group of answer choices negative inducible; negative repressible positive inducible; negative repressible positive inducible; positive repressible negative repressible; negative inducible negative inducible; positive repressible
When referring to attenuation in the regulation of the trp operon it would be safe to say that, when there are high levels of tryptophan available to the organism, ________. tryptophan inactivates the repressor protein translation termination of the trp operon is likely the trp operon is transcribed at relatively high levels the ribosomes stall during translation of the attenuator region transcription termination at the attenuator region is likely
All of the following statements about the repressor of the lac operon of E. coli are true EXCEPT which one? O A. The repressor is the product of a regulatory gene i The repressor binds to the operator region of the DNA of the lac OB. operon. The repressor is a protein. OC. The repressor interacts with the operator in such a way as to OD. prevent translation of beta-galactosidase. The repressor can combine with lactose to form a OE. complex that will no longer bind to the operator region. QUESTION 32 The amino acid which is a precursor of serotonin is Histidine OA. O B. Tyrosine O C. Glutamate D. Tryptophan O E. none of the above
In the lac operon, the product of structural gene lacZ is capable of ________. producing zinc finger nucleases transporting lactose into the cell repressing the lactose operon forming lactose from lactose precursors cleaving the lactose disaccharide into glucose and galactose
The process in which the two-dimensional structure of RNA from the L region of an operon can either prevent or allow transcription of the structural genes is called _____________. Group of answer choices Activation Co-repression Induction Attenuation Repression
If tryptophan is presence in the culture media of E.coli then _________. the promoter will be accessed by the RNA polymerase the repressor will bind to the operator the structural genes of the trp operon will be expressed tryptophan will be synthesized
The regulation of the lac operon in E. coli by Catabolite Activator Protein and glucose is an example of what type of regulation? Group of answer choices Positive inducible Positive repressible Negative inducible Negative repressible Constitutive
The tryptophan (trp) operon is a repressible system. This means the genes are normally expressed, but the presence of trp can repress the operon the genes are normally repressed the genes are normally expressed when trp is present the genes are normally repressed, but the presence of trp can activate the genes
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