5) The bacterial Lac operon is an example of transcriptional regulation. What are the major components and how does this system work as a molecular switch?
Q: In the lac operon system, do the inducers act at the transcription or translation level? Explain why…
A: The lactose operon (lac operon) consists of a regulatory gene (i-gene) and three structural genes -…
Q: What would happen if the operator sequence of the lac operon contained a mutation that prevented the…
A: The Structure Of lac operon --Genes present in the lac operon specify proteins which help in the…
Q: A mutation in the operator region of the trp operon can prevent the trp repressor from binding to…
A: Operons are the functional unit of transcription and regulation of genes in almost all bacteria and…
Q: Explain three types of post-transcriptional modifications to RNA.
A: Post-transcriptional alteration or co-transcriptional adjustment is a bunch of organic cycles normal…
Q: Describe the main features of repressible operons.
A: An operon is defined as a particular set of genes present on a DNA that operates under same…
Q: How does repression work in the lac operon?
A: Lac operon consists of a promoter, operator group of structural genes such as lac A, lac Z, and lac…
Q: Explain, with diagrams, how transcriptionattenuation works in the trp operon.
A: Atteunation is a mechanism of control in some bacterial operons which results in premature…
Q: Please describe in full detail how the LAC operon is controlled by both negative gene regulation and…
A: Lac operon is a gene controlling nit which contains operator, promotor and structural gene region.…
Q: Explain why large amounts of transcript result when a bacterium with a lac Operon is in a medium…
A: Transcription is the process by which RNA is synthesized from DNA. The messenger RNA or mRNA…
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: Gene expression in bacteria is controlled by the operon model. a) Why is the operon model…
A: BASIC INFORMATION OPERON MODEL This model of gene regulation was put forward by Francis Jacob and…
Q: What do you mean by coordinate expression of genes in operon?
A: Answer- In prokaryotes genes are controlled by one promoter region that is called polycistronic…
Q: a mutation that leads to a nonfunctional adenylate cyclase enzyme would lead to what expression…
A: A mutation is a change in the genetic material (the genome) of a cell of a live creature or a virus…
Q: Describe the structure of the Lac operon. How is it turned on? How is it turned off?
A: The gene products of the lac operon are very important for lactose metabolism. This is crucial for…
Q: Based on one strand of a certain segment of DNA with the sequence below, answer the following…
A: DNA or deoxyribonucleic acid is a polymer of deoxyribonucleotides connected together via…
Q: What is the function of the Z gene of the Lac operon?
A: The lactose is cleaved into glucose and galactose by the enzyme β-galactosidase which is coded by…
Q: 1. Gene expression may be regulated after translation using the following mechanisms EXCEPT a. by…
A: Gene expression --Introduction -- Different cell types express different sets of genes . Two…
Q: If the two trp codons in the leader sequence were mutated to stop codons, what effect would it have…
A: DNA is the preferred carrier of genetic information in most living organisms except for certain RA…
Q: Mutation of which of these sequences would have an effect on translational initiation? A. 3’ UTR…
A: Introduction Prokaryotic transcription is the process by which prokaryotic genetic material is…
Q: 1. Lac and Trp Operon are two different processes of sugar and amino acid. Describe the differences…
A: Lac and Trp operon are found in E. coli and other bacteria.
Q: The attenuation mechanism that helps block expression of the tryptophan operon requires all of the…
A: In transcriptional attenuation, the expression of genes are negatively regulated by controlling the…
Q: 4b. Briefly describe the changes in gene expression that happen in the lac operon when lactose is…
A: 4b- lac operon: - Inducible system. - Both positive and negative regulation. - Involved in lactose…
Q: operon
A: Answer: Operon: In genetics, an operon is a functioning unit of DNA containing a cluster of genes…
Q: For each of the 4 regulatory states of the lac operon shown in the following diagram, answer the…
A: Genes active in lactose synthesis are found in E. coli's lac operon. When lactose is present but…
Q: In the histidine operon, if the codons coding for histidine were removed, which of the following…
A: Histidine operon: Histidine operon works by attenuation (premature transcription termination). At…
Q: 2. Assume you have identified a new operon in bacteria (which you call the suc operon) that encodes…
A: The gene expression in prokaryotes is under the control of operon system in which the transcription…
Q: Which enzyme will be produced in a cell where a nonsense mutation is present in the lac operon?
A: In genetics, the mutation in which a sense codon that corresponds to one of the twenty amino acids…
Q: Describe a bacterial operon's structural advantage.
A: *NOTE: Kindly repost for other question. Dear Student as per the guidelines we are supposed to…
Q: For each of the following, match with the stage of gene expression being regulated.…
A: DNA and RNA are nucleic acids present in the organisms. DNA is the deoxy ribose nucleic acid whereas…
Q: What is the major difference between the mechanism involved inattenuation and riboswitches and the…
A: Attenuation is a mechanism that controls gene expression in a bacterial operon and causes premature…
Q: As diagrammed below, some amino acid biosynthetic operons have stem loop structures in the mRNA.…
A: Option A is incorrect as without the formation of heparin the process of translation can not be…
Q: Outline the operon theory using the lac operon as anexample
A: Operon consists of genes placed in sequential order. Lac operon has following genes- Regulator gene…
Q: A. Which operons would be functional under these conditions? lac and trp B. What repressors would be…
A: A. Which operons would be functional under these conditions? Answer - lac and trp operon. B. What…
Q: Bacterial DNA containing an operon encoding three enzymes is introduced into chromosomal DNA in…
A: Prokaryotes are the organisms that lack the cell nucleus and membrane-bound organelles. They have…
Q: According to the operon hypothesis, the Z and Y genes of E. coli are classified as structural genes,…
A: The Lac Operon is responsible for Lactose metabolism and transport in E.coli. This operon consists…
Q: You are studying a bacterial plasmid that contains 3 operons and 9 genes. How many transcriptional…
A: In bacteria, similar and related genes are often found in a cluster on the chromosome, where they…
Q: What is an operon? Describe the functions of regulators, promoters,and operators.
A: The structure responsible for the regulation of genes in order to synthesize the associated proteins…
Q: Name the three transcriptional modifications that happen after transcriptions. What is the purpose…
A: Newly synthesized RNA molecule is called a primary transcript. The most extensive processing of…
Q: B. A researcher was trying to determine whether two molecules (A and B) were corepressors or…
A: A- Molecule A is corepressors Molecule B is inducer In molecule A ,It resemble corepressor…
Q: Many bacterial genes with related functions are arranged in operons, sets of contiguous genes that…
A: Transcription is the first od several steps of DNA based gene expression in which a particular…
Q: For some time, it was not clear whether lac repressor inhibits lac operon transcription by…
A: The binding of the lac repressor to the RNA(ribonucleic acid) polymerase of the lac transcription…
Q: In regulations demonstrated by initiation of transcription, if lactose is abundant, lactose in this…
A: The promoter is a region on the lac operon which is bounded by RNA polymerase to initiates the…
Q: Describe 2 different general ways that a transcriptional regulation protein works. In other ways,…
A: Regulation of the transcription controls when the transcription occurs and how much RNA is created .…
Q: How does regulation of transcription in eukaryotes differ from regulation of transcription in…
A: Prokaryotic organisms are single-celled organisms lacking a cell nucleus. Therefore, their DNA…
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: What does the lac operon consist of? How is the operator switch turned on and off in the expression…
A: Lac operon is the operon or machinery for the transport and metabolism of lactose in Escherichia…
Q: . Listed in parts a through g are some mutations that were found in the 5′ UTR of the trp operon of…
A: The bacterial transcription unit containing more than one gene is known as an operon. An operon has…
Q: . a. How many ribosomes are required (at a minimum)for the translation of trpE and trpC from a…
A: Trp operon is also called as tryptophan operon, a group of genes that encodes biosynthetic enzymes…
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- The a/a operon is an inducible operon that controls the production of the sugar arabinose. When arabinose is present in a bacterium it binds to the protein AraC, and the complex binds to the initiator site to promote transcription. In this scenario, AraC is a(n). activator inducer repressor operatorProvide the SIGNIFICANT differences between the following: 1. Operon Systems Inducer/Lac Repressor/Trp a. b. c. d. 2. Regulation of Transcription Activators Repressors a. b.In the lac operon system, do the inducers act at the transcription or translation level? Explain why it acts in that level in a short but concise way.
- 1. a)how is it possible for such drugs to selectively kill bacterial cells and not our own cells? b)Provide an example of post-translational regulation of protein activity and explain the advantage of regulating each protein/process at the post-translational level instead of the transcriptional level.What would happen to the regulation of the tryptophan operon in bacterial cells that express a mutant form of the tryptophan repressor that (1) cannot bind to DNA, (2) cannot bind tryptophan, or (3) binds to DNA even in the absence of tryptophan?Based on one strand of a certain segment of DNA with the sequence below, answer the following question: 3’-ATGGATCCCATC-5’ What must the primary amino acid sequence be (assuming that the above sequence does not require post-transcriptional modification)?
- The transcription of many bacterial genes relies on functional groups called operons, such as the tryptophan operon. What is an operon?Bacterial DNA containing an operon encoding three enzymes is introduced into chromosomal DNA in yeast (a eukaryote) in such a way that it is properly flanked by a promoter and a transcriptional terminator. The bacterial DNA is transcribed and the RNA correctly processed, but only the protein nearest the promoter is produced. Can you suggest why?. a. How many ribosomes are required (at a minimum)for the translation of trpE and trpC from a singletranscript of the trp operon?b. How would you expect deletion of the two tryptophan codons in the RNA leader to affect theexpression of the trpE and trpC genes?
- Many bacterial genes with related functions are arranged in operons, sets of contiguous genes that are under the control of a single promoter and are transcribed together. (a) What is the advantage of this arrangement? (b) How might eukaryotic cells, which do not contain operons, ensure the simultaneous transcription of different genes?1. a) If glucose is not available and lactose is absent from the environment, what is the status of transcription of the lac operon genes? Explain your answer from both an evolutionary perspective and in terms of negative and positive regulation of the operon? b)If glucose is not available, but lactose is available from the environment, what is the status of transcription of the lac operon genes? Explain your answer from both an evolutionary perspective and in terms of negative and positive regulation of the operon? b)7.17 Contrast the regulation of an inducible operon with that of a repressible operon, and give an example of each.
