Which of the below conditions would result in the lowest level of expression from the lac operon High lactose, low glucose, mutation in lac repressor so that it can bind the operator and lactose at the same time High lactose, high glucose, mutation in sigma 70 protein that increases its affinity for binding the promoter No lactose, deletion of the operator sequence, low glucose High lactose, high glucose, changing the-35 and -10 region of the promoter to the consensus sequend for sigma 70 binding
Q: n both glucose and lactose are present (regarding the lac operon): Group of answer choices…
A: An operon is a unit of gene expression found in bacteria that aids in the regulation of gene…
Q: As trytophan levels increase in the cell, _____ bind(s) to active aporepressors, causing ______ of…
A: trp operon: The trp operon codes for the components required for tryptophan production. An operon…
Q: When an individual drink's a product with lactose (e.g., whole milk), what happens to the repressor…
A: Lac Operon consist of of an operator region promoter region and structural gene region. This Operon…
Q: Operons can not be: a. Negatively regulated b. Positively regulated c. Constitutive d. Inducible…
A: The workhorses of a body are proteins. All or every function of the body are carried out by the…
Q: Maltose utilization in E. coli requires the proteins encoded by genes in three different operons.…
A: It is given that the maltose utilisation in E.coli requires the proteins which are encoded by genes…
Q: In the lac operon, the product of structural gene lacZ is capable of ________. producing zinc…
A: The lac operon is an operon, or gathering of genes with one promoter. The genes in the operon encode…
Q: The trp operon in E. coli encodes enzymes essential for the biosynthesis of tryptophan. In the…
A: trp operon is a repressor operon found in E. coli bacteria, which consists of a group of genes that…
Q: ttenuator control of the Trp operon what is the correct option from the choices below? involves a…
A: The trp operon, found in E. coli bacteria, is a group of genes that encode biosynthetic enzymes for…
Q: Regulation of the E. coli trp operon by attenuation requires the trp repressor protein. prevents…
A: An operon is a function unit of DNA containing a set of genes including structural gene, a…
Q: Similar to the Lac operon, the Ara (arabinose) operon genes are most highly expressed when Both…
A: Similar to the Lac operon, the Ara (arabinose) operon genes are most highly expressed when Cyclic…
Q: cAMP binds to cAMP Receptor Protein (CRP), allowing CRP to bind to the promoter of the lac operon
A: Almost all bacteria such as E. coli contains lac operon which operates in utilization of lactose as…
Q: A mutation in the lac I gene that prevents production of the lac repressor choose an answer below:…
A: lac operon also known as lactose operon was discovered by F. Jacob and J. Monod, for that, they…
Q: 1d regulation of the lack operon by the lack repressor is an example of negative regulation. what in…
A: E.coli bacterium intake glucose as a primary source of energy metabolism . When a glucose is scarce…
Q: m. In the figure below, the bacterial activator protein CAP and the Lac repressor have been placed…
A: Introduction :- The lac operon is a group of genes with a single promoter that encode genes for…
Q: Which of the following mutations would result in the highest level of lac operon transcription in…
A:
Q: What are the effects of the following conditions on Lac operon of bacteria? Do not forget to mention…
A: Lac Operon helps in the metabolism of lactose in bacteria.
Q: An E. coli cell acquires a mutation in the gene that encodes CAP. The mutation affects the…
A: The transcription is a process through which information in the DNA molecule is transcribed into…
Q: Which of the following describes the lac operon in E. coli when lactose and glucose is present in…
A: The lac repressor acts as a lactose sensor. It normally blocks transcription of the operon, but…
Q: Mutations may have an effect on the expression of the lac operon and the trp operon. Would the…
A: Mutations are defined as the change in the sequence of DNA of an organism due to any environmental…
Q: What are the effects of the following conditions on Lac operon of bacteria? Do not forget to mention…
A: lac operon: - inducible operon. - Both positive and negative regulation. - Involved in lactose…
Q: Bacteria with a lac phenotype are unable to use lactose because of some defect in expressing the…
A: Answers - 1) False 2) True 3) True There are 3 structural genes in lac operon - lac Z, lac Y and…
Q: For the lac operon, when glucose is absent and lactose is present ___________ None of the…
A: Question - For the lac operon, when glucose is absent and lactose is present ___________…
Q: Maltose utilization in E. coli requires the proteins encoded by genes in three different operons.…
A: The process of maltose utilization in E.coli requires the proteins encoded by genes in three…
Q: High levels of glucose in the environment result in low levels of transcription of the lac operon.…
A: Answer- glucose lowers the levels of cAMP, which is necessary to activate the CAP protein
Q: What is the role of catabolite activator protein (CAP) in the lactose operon of E. coli? it…
A: Catabolite activator protein is a transcriptional activator. It binds RNA polymerase and activates…
Q: Regarding the tryptophan operon in bacteria, in the presence of tryptophan, tryptophan binds to the
A: Q. Regarding the tryptophan operon in bacteria, in the presence of tryptophan, tryptophan binds to…
Q: consider the fec operon of Staphylococcus madeupiddis, which encodes an iron citrate uptake system.…
A:
Q: How does the repressor protein contribute to selective expression of the structural genes Z, Y, and…
A: The prokaryotic gene expression is regulated by operon system, that regulates the transcription of…
Q: Assuming that the level of glucose is low, a mutation in the repressor associated with the lac…
A: The lac operon which is also known as lactose operon is a set of genes that are specific for uptake…
Q: Which of the following is true about the Lac operon? Group of answer choices An operon with a…
A: Operon is the cluster of genes found in DNA. It consists os regulatory gene, structural gene,…
Q: Contrast the effects of mutations in genes encoding sporulation-specific sigma factors with…
A: Introduction Mutation in sigma factors:- Sigma factors are subunits of all bacterial RNA…
Q: For each description, state if the gene expression will increase (1), decrease (2) or remain the…
A: The transcription is a process through which information in the DNA molecule is transcribed into…
Q: If an E. coli cell is exposed to glucose, what happens? O A) CAMP levels are increased and the…
A: The lac operon of E. coli contains genes involved in lactose metabolism. It's expressed only when…
Q: A mutation occurs in the lac operon operator site such that LacI can no longer bind to the operator…
A: Lac I stands for lac inhibitor. It's major function is to turn off the lac operon in the absence of…
Q: What is the role of catabolite activator protein (CAP) in the lactose operon of E. coli?
A: Lac operon Lac operon is a group of protein that code for enzyme β-galactosidase. The function of…
Q: Like the lac operon, the hexose operon is controlled by a separate regulatory protein under the…
A: Hexose operon is the segment of DNA which includes regulatory gene, structural gene, promoter and…
Q: The fictional bacteria Plumbumbacter aurus converts the lead ions to gold ions and uses the…
A: Gene regulation at the level of transcription in bacteria is achieved by the operon model. Operon…
Q: The operator of the lactose operon in E. Coli is located: between the promoter and the…
A: The lac operon in Ecoli is concerned with the digestion process of the lactose sugar. For this gene…
Q: Like the lac operon, the hexose operon is controlled by a separate regulatory protein under the…
A: The operons are regions in DNA which have a cluster of related genes and these function as a unit.…
Q: Which of the following statements about the lactose operon in E. coli is TRUE? ) It contains the…
A: An operon is a functional unit of DNA (Deoxyribonucleic acid) containing a cluster of genes under…
Q: The lac operon is a negative inducible system and allolactose will bind to the regulator protein…
A: In normal state, the lac operon is generally turned off. A repressor protein during "off" stage,…
Q: Which of the following statements about the lactose operon in E. coli is FALSE? Choose an answer…
A: The lac operon of E. coli contains genes involved in lactose metabolism. It's expressed only when…
Q: What would occur if the repressor of an inducible operon were mutated so it could not bind the…
A: The operon is the gene regulation system in prokaryotes that ultimately responsible for the…
Q: The blob operon produces enzymes that convert compound A into compound B. The operon is controlled…
A: Operon is a term used for the functional unit of the DNA that contains the cluster of genes which…
Q: consider the fec operon of Staphylococcus madeupiddis, which encodes an iron citrate uptake system.…
A: The fec operon is responsible for regulating the expression of iron in the cytoplasm of cell.
Q: In the tryptophan operon, tryptophan is considered a Group of answer choices coactivator inducer an…
A: Step 1 Jacob and Monad (1961) from their study in bacterial genetics proposed that genetic material…
Q: An E. coli cell as the following genotype for the lac operon system: I- OC Z+ / F’ I+. Which term…
A: The presence I+ repressor is dominant to the absence of a repressor I-. Oc mutants:- these are the…
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Solved in 2 steps
- 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 transcriptionINTERPRET DATA Develop a simple hypothesis that would explain the behavior of each of the following types of mutants in E. coli. Mutant a: The map position of this mutation is in the trp operon. The mutant cells are constitutive; that is, they produce all the enzymes coded for by the trp operon, even if large amounts of tryptophan are present in the growth medium. Mutant b: The map position of this mutation is in the trp operon. The mutant cells do not produce any enzymes coded for by the trp operon under any conditions. Mutant c: The map position of this mutation is some distance from the trp operon. The mutant cells are constitutive; that is, they produce all the enzymes coded for by the trp operon, even if the growth medium contains large amounts of tryptophan.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
- High levels of glucose in the environment result in low levels of transcription of the lac operon. The reason for this is ____________________________________________. glucose lowers the levels of the CAP protein, which is necessary to stimulate transcription of the lac operon glucose binds to the Lac Repressor to cause it to bind to the operator site (lac O) glucose raises the levels of cAMP, which binds to the CAP protein to cause transcription repression glucose prevents lactose from binding to the Lac Repressor glucose lowers the levels of cAMP, which is necessary to activate the CAP proteinWhich 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 repressorWhich of the following describes the lac operon in E. coli when lactose and glucose is present in the culture medium? Select one: a. CAP inactive and RNA polymerase does not completely bind to the promoter of the lac operon and transcription of lactose-metabolizing enzymes decreases. b. CAP is active and RNA polymerase binds completely to the promoter of the lac operon and transcription of lactose-metabolizing enzymes decreases. c. Catabolite activator protein (CAP) inactive and RNA polymerase does not completely bind to the promoter of the lac operon and transcription of lactose-metabolizing enzymes increases. d. CAP is active and RNA polymerase binds completely to the promoter of the lac operon and transcription of lactose-metabolizing enzymes increases.
- 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 increasesIn the lac operon, the lacZ gene codes for an enzyme called ____________, which catalyze the breakdown of the sugar __________ into monosaccharides. This enzyme can also hydrolyze the sugar analog ____________, which produces blue pigments following its breakdown. Since the lac operon is not always on the bacterial cells, we add the chemical ________ which prevents the lac depressor from binding to the operators, leading to constitutive expression of the operon.For the lac operon, when glucose is absent and lactose is present ___________ None of the options cAMP-CAP is bound to the operator and the repressor is not bound to the promoter cAMP-CAP is not bound to the promoter and the repressor is bound to the operator cAMP-CAP is bound to the promoter and the repressor is not bound to the operator
- 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 levelsWhat 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 absentThe 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.