A mutation that inactivates transcription and translation from the regulatory gene of an inducible operon could result in: Group of answer choices A inactivation of RNA polymerase. B irreversible binding of the repressor to the operator. C three of these choices are correct D inhibition of transcription of the structural genes within the operon. E two of these choices are correct F transcription of the structural genes within that operon.
Q: Assuming that the level of glucose is low, a mutation in the repressor associated with the lac…
A: The lac operon stands for lactose operon. These are a set of genes that are found in E.coli and…
Q: Match the key complex or product to its related process of regulating gene expresSion. a.…
A: Operon is a functional unit of DNA. It contains a cluster of genes transcribed in mRNA and…
Q: In E. coli, induction in the lac operon and repression in the trp operon are both examples of a.…
A: Transcription, translation, post-transcription and post-translation. The process in which the gene…
Q: Explain and give examples of Inducible & Repressible Operons. Describe what types of protein…
A: Inducer: Inducer is the substance that causes the gene for protein synthesis to be activated.…
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: The trp operon, found in E. coli, is a group of genes that encode biosynthetic enzymes for the amino…
A: When tryptophan levels are low tryptophan operon is induced to transcribe structural genes so that…
Q: Components necessary for regulating the /trp/ operon do NOT include
A: Answer - Option E - CAP protein
Q: The polycistronic Histidine Operon in E. coli encodes all of the proteins necessary for the…
A: An operon is a gene unit of bacterial system whose transcription is positively and negatively…
Q: What would occur if the repressor of an inducible operon weremutated so it could not bind the…
A: An operon is a functional unit of genomic DNA made up of group of genes that is controlled by a…
Q: If there was a mutation such that the lac I protein could no longer bind lactose, but could still…
A: Lac operon is responsible for the metabolism of lactose in bacteria.
Q: A novel operon is controlled by two regulatory systems that function in a hierarchy. The first is…
A: An operon can be defined as the cluster of coordinately controlled and regulated genes. It is…
Q: How does the lac operon regulate lactose digestion in bacteria?a. The repressor protein becomes a…
A: The lac operon of E. coli contains genes concerned with lactose metabolism. It's expressed only if…
Q: Choose the best options, by dragging and dropping the colour coded text boxes below, that fill in…
A: Operon is transcription unit of prokaryotic genome with consist of many contiguous structural genes…
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: ptoph had a mutation on the repressor, not allowing it to bind with tryptophan. The repressor is…
A: Operons are proteins encoded together as a block that performs specific functions and are involved…
Q: High levels of transcription of the lactose operon require all of the following, EXCEPT: A) O the…
A: Lac operon is a gene regulatory mechanism associated with bacterial species while using lactose for…
Q: . What is the function of operons in bacterial gene regulation? b. Describe how a bacterial…
A: a. What is the function of operons in bacterial gene regulation? b. Describe how a bacterial…
Q: A mutation prevents the catabolite activator protein (CAP) from binding to the promoter in the lac…
A: Mutation means sudden changes occur in DNA sequences. The mutation occurs randomly. It also occurs…
Q: Operons encoding catabolic enzymes are often _______, while those encoding anabolic enzymes are…
A: Answer - Option B - Activated by their enzymatic substrate; inhibited by the presence of their…
Q: ou have isolated different mutants (reg1 and reg2) causing constitutive expression of the emu operon…
A: The operon's regulation can take place positively or negatively. If the negative operator is bound…
Q: One way that regulation is often studied is by examining the effects of mute ons. For example,…
A: There are two types of lac mutations occurring in lac operon: 1. uninducible - operon can't be…
Q: You mutated the gene encoding the cyclic AMP receptor protein (CRP). In this mutant, the CRP is…
A: Operon is a gene regulatory structure that contains clusters of genes and these clusters of genes…
Q: In a bacterial operon, the active repressor bind to the A. promoter. B. terminator. C.…
A: The operon concept can be defined as a DNA containing a set of genes that are transcribed basically…
Q: Operons involved with the biosynthesis of molecules such as amino acids are most likely to be…
A: A repressible operon encodes for anabolic enzymes. The genes that encode these anabolic enzymes tend…
Q: A researcher was trying to determine whether two molecules (A and B) were corepressors or inducers…
A: Gene expression is predominantly regulated at the transcriptional level, owing to protein binding to…
Q: One of the main lessons of this chapter is that several bacterial genes are often transcribed from a…
A: As given: Several bacterial genes are often transcribed from a single promoter into a large…
Q: When referring to attenuation in the regulation of the trp operon it would be safe to say that, when…
A: Attenuation is a regulatory mechanism that is employed in bacterial operons to guarantee that…
Q: Consider the following scenario: A bacteria cell is surrounded by lactose, but there is no glucose…
A: Lac operon is an operon model takes place in E coli bacteria . It consists of :- A)Promoter B )…
Q: If a researcher moves the operator to the far end of the operon, which of the following processes…
A: An operator is a genetic sequence that helps the DNA sequence to attach proteins in charge for…
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: Assume you have identified a new operon in bacteria (which you call the suc operon) tha encodes…
A: Any bacterial gene can be classified as an operon.An operon is a collection of bacterial genes with…
Q: In the trp operon, if a mutation occurred in the gene for the repressor so that it could bind to the…
A: Bacteria like Escherichia coli (a friendly gut bacterium) require amino acids to survive since they,…
Q: If a researcher moves the promoter for the lac operon to the region between the beta galactosidase…
A: Since you have asked multiple question, we will solve the first question for you. If you want any…
Q: G) A mutation has occurred rendering the regulatory protein unable to recognize the operator…
A: From the given information it is cleat that regulatory protein is activator (positive regulator) of…
Q: Theara operon is an inducible operon that controls the production of the sugar arabinose. When…
A: An operon is a group of genes that are transcribed together and are under the influence of a single…
Q: Define the following in the context of operons: a. positive control b. give an example of an…
A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…
Q: Consider a hypothetical operon for alanine degradation. Alanine would most likely influence the…
A: Alanine is an amino acid that is catabolized in the enzymatic processes.
Q: The figure at the beginning of this chapter showsthe binding of both a Lac repressor tetramer and…
A: Lac operon is an operon that involves in the transport and metabolism of lactose in humans and many…
Q: When referring to attenuation in the regulation of the trp operon it would be safe to say that, when…
A: The trp operon is present in E.coli bacteria and is a group of genes that synthesizes biosynthetic…
Q: The tryptophan operon is a repressible operon that is A. transcribed only when glucose is present…
A: The tryptophan operon is a repressible operon that is - B. not transcribed whenever tryptophan is…
Q: The activator (V protein) that is present in the bacterial cell is normally phosphorylated, but only…
A: Phosphorylation alters the structural conformation of a protein, causing it to become activated,…
Q: A. The gene that regulates the production of the Lacl protein is found further upstream of the lac…
A: Since you have asked multiple questions, we will solve the first question for you. If you want any…
Q: There is a mutation in sequence of the lac operator that prevents the lac repressor from being able…
A: Gene expression is regulated at the level of transcription by operon systems. In prokaryotes,…
Q: . In an effort to determine the location of an operator sitefor a negatively regulated gene, you…
A: An operator is a genetic sequence which allows proteins responsible for transcription to attach to…
Q: Which of the following statements is false?a) A derivative of lactose serves as an inducer of the…
A: Introduction: In bacteria, an operon is a coordinated component of genetic expression. In 1961,…
Q: Discuss the regulation of the tryptophan operon. How does this story change under the two…
A: Introduction: The trp operon is a collection of genes found in E. coli bacteria that code for…
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…
A mutation that inactivates transcription and translation from the regulatory gene of an inducible operon could result in:
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- INTERPRET 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.A mutation in the operator region of the trp operon can prevent the trp repressor from binding to this operator. When these mutant cells are placed in a solution containing chicken broth, which of the following happens? a. Tryptophan would bind to the repressor. b. The Repressor would bind to the operator irrespective of the presence of amino acids in the environment. c. The transcription of the trip operon would be inhibited. d. The transcription of the repressor protein is inhibitedWhich of the following statements is false?a) A derivative of lactose serves as an inducer of the lac operon.b) Signal transduction provides a mechanism for a cell to sense the conditions of its external environment.c) Quorum sensing allows bacterial cells to sense the density of like cells.d) An example of a two-component regulatory system is the lactoseoperon, which is controlled by a repressor and an activator.e) An ORF is a stretch of DNA that may encode a protein.
- 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 presentIn 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.What would occur if the repressor of an inducible operon weremutated so it could not bind the operator?(A) irreversible binding of the repressor to the promoter(B) reduced transcription of the operon’s genes(C) buildup of a substrate for the pathway controlled by theoperon(D) continuous transcription of the operon’s genes
- The gad operon is controlled by a number of transcription factors that regulate a promoter of approximately 450bp. Which would NOT explain why bacterial promoters are shorter than the typical eukaryotic promoter? a. Bacteria do not have nucleosomes b. Bacteria do not have mediator complex c. Each operon is regulated by only one signal d. All of the above are true1. 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: a. constitutive expression of the lac operon genes b. lack of expression or refuced expression of the lac operon genes under all circumstances c. expression of the genes only when lactose is present d. expression of the genes only when lactose is absent e. lack of expression of the lac operon genes, resulting in an increase in lactose productionYou are growing E. coli in a laboratory in order to study their operons. The growth media you are using contains lactose, no glucose and no tryptophan. Using your knowledge of operons and their regulation a.Which operons would be functional under these conditions? b.What repressors would be made? (NOTE: name the repressors using their gene names) c.Which repressor(s) would be made in the inactive form? d.Which repressor(s) would be made in the active form? e.Which repressor(s) under these conditions can bind the operator sequence? f.Which repressor(s)under these conditions cannot bind the operator sequence?
- Which of the following statements about the trp operon is false? If a mutation in region 2 prevents the formation of the 2 + 3 loop in the 5’UTR transcription levels will increase. The trp operon is an example of negative repressible operon. Formation of the anti-terminator in the 5’UTR of the trp operon occurs when trp levels are low. In the presence of high trp-tRNA, the genes of the trp operon are not expressed. The role of trp is to bind to the repressor protein and activate it.Mutations may have an effect on the expression of the lac operon and the trp operon. Would the following mutations have a cis- or transeffect on the expression of the protein-encoding genes in the operon? A. A mutation in the operator site that prevents lac repressor from binding to it B. A mutation in the lacI gene that prevents lac repressor from binding to DNA C. A mutation in the trpL gene that prevents attenuationThe figure at the beginning of this chapter showsthe binding of both a Lac repressor tetramer and aCRP-cAMP complex to the regulatory region of thelac operon.a. What is the key feature of a regulatory protein suchas the Lac repressor or CRP that allows it to regulate specifically the genes or operons it is supposedto control?b. On the figure, show the positions of the followingcomponents: (i) A Lac repressor monomer; (ii) a Lacrepressor dimer; (iii) all four DNA binding domains ofthe Lac repressor tetramer; (iv) a single helix-turnhelix motif; (v) the o1 part and either the o2 or o3 partsof the lac operator (assume the operon would be transcribed from right to left on the figure); (vi) themultimerization domains of the four Lac repressormonomers; (vii) an inducer-interacting domain; (viii)the CRP-cAMP complex; and (ix) a DNA loop.c. What is the physical basis for the formation of theDNA loop shown in the figure?d. On the figure, show the position of two axes ofsymmetry in the sequence…