A mutation in the lac I gene that prevents production of the lac repressor choose an answer below: renders the lac operon transcriptionally inactive. leads to constitutive expression of the lac operon. leads to constitutive expression of the trp operon. abolishes the effect of glucose on the transcription of the lac operon. none of the above

A mutation in the lac I gene that prevents production of the lac repressor choose an answer below: renders the lac operon transcriptionally inactive. leads to constitutive expression of the lac operon. leads to constitutive expression of the trp operon. abolishes the effect of glucose on the transcription of the lac operon. none of the above

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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Describe the main functional differences between the TRP and the Lac operons. Main functional differences DO NOT refer to the fact that one operon involves TRP and the other involves Lac. They also don’t include that there are different genes found in the TRP operon compared to the Lac operon or that the repressor in the Lac operon is called Lac l. Also DO NOT simply list how both operons work to answer this question.
The lac operon regulates expression of genes required for the breakdown of lactose. Use the schematic diagram of the lac operon to help you answer the following questions about the lac operon. Representation of the Lac operon and upstream regions in E.coli (not drawn to scale!) Indicates 1,000s bases Indicates regions of DNA lacz lacz lacz gene gene gene Lac I promoter Lac I gene CRP lacZ lac lac Z lacY lacA binding site promoter operator gene gene gene When wild-type E. coli are grown in media with high lactose and no glucose, which of the following statements are true? There is a basal level of lac Z, Y and A transcription RNA polymerase can bind tightly to the lac Z promoter and activate a high level of transcription RNA polymerase can bind tightly to the lac I promoter and activate a high level of transcription CRP protein is bound to the CRP binding site
The lac operon regulates expression of genes required for the breakdown of lactose. Use the schematic diagram of the lac operon to help you answer the following questions about the lac operon. Representation of the Lac operon and upstream regions in E.coli (not drawn to scale!) Indicates 1,000s bases Indicates regions of DNA lacz lacz lacz gene gene gene Lac I promoter Lac I gene CRP lac Z lac lac Z lacY lacA binding site promoter operator gene gene gene When wild-type E. coli are grown in media with high lactose and no glucose, which of the following statements are true? V There is a basal level of lac Z, Y and A transcription RNA polymerase can bind tightly to the lac Z promoter and activate a high level of transcription RNA polymerase can bind tightly to the lac I promoter and activate a high level of transcription CRP protein is bound to the CRP binding site
A mutation in the lac operator that prevents binding of the lac repressor to the operator What is the correct option from the choices below? renders the lac operon transcriptionally inactive. leads to constitutive expression of the lac operon. affects the interaction between the lac repressor and allolactose. affects the interaction between CAP and cAMP. none of the above
Regulation of the E. coli trp operon by attenuation requires the trp repressor protein. prevents transcription of the trp operon structural genes in response to high levels of charged tryptophan TRNAS. occurs because tryptophan binds to the trp repressor. prevents transcription of the trp operon structural genes in the presence of high levels of glucose.
Which of the following is true about the Lac operon? Group of answer choices An operon with a constitutive operator (O^C mutation) will transcribe in the presence of a super repressor It is a positive repressible operon that is influenced mainly by fluctuations in glucose levels Produces a large quantity of tryptophan in order to synthesize lactase It is found in eukaryotes and is responsible for creating an enzyme that breaks down lactose
The figure above shows the structure of lac operon. Which of the following BEST describes what happens in the presence of lactose? Select one: Repressor-lactose complex forms, both the complex and RNA polymerase bind to R. Transcription of S is initiated. Repressor-lactose complex forms and the complex will not bind to R. Transcription of S is initiated. Both repressor and RNA polymerase bind to R. Transcription of S is initiated. Repressor-lactose complex forms and the complex binds to R. Transcription of S is prevented.
Indicate whether each of the following statements about the lac operon are true or false: Bacteria with a lac phenotype are unable to use lactose because of some defect in expressing the genes A constitutive Lac+ phenotype could mean either that the production of repressor is defective or that the operator sequence is defective The lacl gene is next to, but is not part of, the lac 1. TRUE operon 2. FALSE Bacteria with a lac* phenotype cannot grow on media containing lactose as the only sugar The structural genes of the lac operon are each transcribed as a separate MRNA Expression of the Lac Repressor from the lacl promoter is regulated by lactose
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
Study the depiction of the lac operon in Figure 11.2. Normally, the genes are turned off when lactose is not present. Lactose activates the genes, which code for enzymes that enable the cell to use lactose. Mutations can alter the function of this operon. Predict how the following mutations would affect the function of the operon in the presence and absence of lactose: a. mutation of regulatory gene; repressor will not bind to lactose b. mutation of operator; repressor will not bind to operator c. mutation of regulatory gene; repressor will not bind to operator d. mutation of promoter; RNA polymerase will not attach to promoter
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
The role of allolactose in the lac operon is to: Regulate the amount of lactose that enters the cell Bind to and inhibit repressor proteins that normally block "communication" between the promoter and operator Stimulate the production of lac A gene