1. (a) Lactose levels are high Lac Operon Genes are switched OFF Lac Operon Genes are switched ON Does NOT affect the gene expression (b) Enhancer and activator proteins are working together Gene is switched ON Gene is switched OFF Does NOT affect the gene expression
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: Describe operons in your own words, as if you were explaining what an operon is to someone who knew…
A: DNA is the biomolecule which contains all biological information in an organisms . the part of the…
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: Can you explain what exactly operon is? Instead of just copying and pasting from google, can you…
A: DNA DNA are the inheritable unite which passes from parents to their offsprings. DNA contains genes…
Q: When tryptophan levels in the cell are low A the trp repressor will be bound and the operon…
A: DNA and RNA are nucleic acids present in the organisms. DNA is the deoxy ribose nucleic acid whereas…
Q: A mutation at the operator prevents the regulator protein from binding. What effect will this…
A: An operon includes a group of genes that have a common promoter, regulator, and would be transcribes…
Q: In the absence of lactose, the genes of the lac operon are: Not transcribed; because there is…
A: Introduction In E. coli and numerous other enteric bacteria, the lactose operon (lac operon) is a…
Q: IS binding to the repressor, rendering it inactive and turning the operon on. Lactose is binding to…
A: The lac operon is an operon, or group of genes with a single promoter.The genes in the operon encode…
Q: According to the operon model, for the synthesis of an inducible enzyme to occur, the end-product…
A: DNA is the genetic material in most living organisms. It is the information hub of the cell that…
Q: In order for the lac operon to be triggered, lactose must be present and ________. a. cAMP levels…
A:
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: Study the illustration of the lac operon below. Normally, the genes are switched off when lactose is…
A: 1. When lactose is unavailable, the lac repressor binds strongly to the operator, inhibiting RNA…
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: If an operon is controlled by an activator and the substrate of the metabolic pathway then the type…
A: An operon can be defined as that functional unit of DNA containing many genes, all of which are…
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: Lac operon regulation under allolactose functions under____________ control; trp operon regulation…
A: Operon is the segment of DNA which includes regulatory gene, promoter gene, operator gene and…
Q: Expression of the operon ultimately results in the synthesis of the repressor (Q) and co-repressor…
A: A repressor is a protein that turns off the expression of one or more genes. The repressor protein…
Q: One strategy for producing a protein in the milk of a cow is toplace the coding sequence of the gene…
A: One strategy for producing a protein in the milk of a cow is toplace the coding sequence of the gene…
Q: he lac operon, determine whether genes will be expressed (on) or silenced (off) given the following:…
A: IN option A Lactose levels are high, glucose is low.---- Genes will be expressed(on).
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: What is lac operon system?
A: Lac operon is one of the method by which a prokaryotic cell control gene expression. The lac operon…
Q: All the following are characteristics of inducible operons except they are normally inactive they…
A: Inducible operons are catabolic pathways as the enzymes involved in catabolism do not need to be…
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: For an enzyme to be produced from an inducible operon, the repressor must bind to and digest the…
A: The operon is defined as a set of genes transcribed together and is regulated by one promoter. The…
Q: The bacteria E Coli uses the Trp operon to control its production of tryptophan-producing enzymes.…
A: There are five structural genes in the tryptophan Operon along with the operator and the promoter…
Q: The tryptophan (trp) operon is a repressible system. This means the genes are normally expressed,…
A: Amino acids are essential for the survival of bacteria like E. coli. There are several amino acids…
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: The tryptophan operon is regulated by two methods. Describe in detail the regulation of the operon…
A: Genes are the functional unit of heredity. Operons are a group of genes under a single promoter. The…
Q: What is the effect of a mutation in the allosteric site of the Lac Repressor protein?
A: Lac operon (often called lactose operon) is an important operon sequence required for the metabolism…
Q: Say you have an operon called the CAKE operon, it contains genes for the enzymes require to convert…
A: An operon consists of a set of genes regulated by a single promoter. The products of these genes are…
Q: The lac operon has which of the following characteristics? O 1) usually requires an activator…
A: In Eukaryotes all genes are separate and produce individual mRNAs on transcription. However, in…
Q: Mutations in the genes of an operon could affect the expression of its genes. For each statement,…
A: Introduction: Mutation can be defined as any change in DNA. This is any heritable and genetic change…
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: In the lac operon system, lactose is considered the ___________, and when the gene lacI is mutated…
A: The genes are the hereditary unit of an organism which are passed on from the parental generation to…
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: An activator (protein “V” – not encoded by this operon) binds to the activating region and RNA…
A: A transcriptional activator is a protein (transcription factor) that increases gene transcription of…
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: The illustration below shows the lac operon used in E. coli. Explain what is happening in the bottom…
A: An operon is a set of genes that get transcribed into single mRNA using one promoter. These operons…
Q: Positive repressible means the regulatory protein is a(n) ______, and the operon is ______ when the…
A: In the case of the positive repressible operon, the activator protein is found to be bound and…
Q: What is a specific region in the trp operon that you could mutate so it expresses the trp operon in…
A: Introduction : The Trp Operon Codes For The Components Required For Tryptophan Production. An Operon…
Q: The /lac i/ gene: a)is expressed constitutively. b) is not regulated. c) is not a part of the…
A: ANSWER;- e) encodes a product that binds to the /lac/ operator. and it is also a structural gene…
Q: A mutation at the operator site of a positive inducible operon that causes the sequence of the…
A: The majority of mutations in the operator, the repressor's binding site, result in lesser…
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: 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: Say you have an operon called the CAKE operon, it contains genes for the enzymes require to convert…
A: The operon model is considered as a cluster of functional genes that are activated in response to…
Q: Distinguish between positive and negative control. Give examples of each from the lac operon
A: Operator is a unit consisting of one or more cistrons that function coordinately under the control…
Q: When lactose is present lactose induces the activation of the genes in the lac operon by binding…
A: The Lac operon is an inducible operon that is inhibited by a repressor protein in the absence of…
1. (a)
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Lac Operon Genes are switched OFF
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Lac Operon Genes are switched ON
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Does NOT affect the gene expression
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Gene is switched ON
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Gene is switched OFF
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Does NOT affect the gene expression
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Step by step
Solved in 2 steps
- know what an operon is and the elements of the operon model; know the function of each of these elements (regulator, operator, promoter, structural genes); know the differences between inducible and repressible operonsThe trp operon in E. coli is a negative repressible operon. This implies that... a. The trp operon makes use of an activator and can be turned "on" (i.e., is normally "off") b. The trp operon makes use of an activator and can be turned "off" (i.e., is normally "on) c. The trp operon makes use of a repressor and can be turned "on" (i.e., is normally "off") d. The trp operon makes use of a repressor and can be turned "off" (i.e., is normally "on") e. None of the aboveA mutation occurs in the lac operon operator site such that LacI can no longer bind to the operator site. The effect that this mutation has on the cell is that a. the activity of the lac operon will not be affected. b. the cell can no longer convert lactose to glucose. c. the expression of the lac genes cannot be turned off. d. the expression of the lac genes cannot be turned on.
- 1. What is the default state of the lac operon? a. LacI repressor is sitting on the operator sequence and blocks RNAP from transcribing lacZYA. b. LacI repressor is not in a correct shape to bind to the operator sequence. c. LacI repressor is not produced in the absence of lactose. d. Allolactose is sitting on the operator sequence and blocks RNAP from transcribing lacZYA.Which of these BEST DESCRIBE tryptophan in the Trp Operon? A. Acts as a corepressor B. Acts as a coactivator C. Acts as an inducer D. Acts as an enhancerStudy the illustration of the lac operon below. Normally, the genes are switched off when lactose is not present. Lactose activates the genes, which code for enzymes that allow the cell to use lactose. Mutations can alter the functions of this operon. Predict how the following mutations would affect the function of the operon the absence and presence of lactose. Mutation of regulatory gene; repressor will not bind to lactose. Mutation of operator; repressor will not bind to operator. Mutation of regulatory gene; repressor will not bind to operator. Mutation of promoter; RNAP will not attach to promoter.
- In 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.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 proteinOne strategy for producing a protein in the milk of a cow is toplace the coding sequence of the gene of interest next to a__________ and then inject the gene into a _________.a. lac operon promoter, cow oocyteb. β-lactoglobulin promoter, cow oocytec. lac operon promoter, cow mammary celld. β-lactoglobulin promoter, cow mammary cell
- 1) Assume you have an operon that is repressible. In this case, the rate of synthesis of repressor protein must depend on the level of a) co-repressor b) inducer c) both d) neitherComponents necessary for regulating the /trp/ operon do NOT include a. tryptophan. b. repressor protein. c. operator sequence. d. promoter sequence. e. CAP protein. f. cellular levels of protein synthesis.a. What is the function of operons in bacterial gene regulation? b. Describe how a bacterial operon can be regulated by repressible proteins (such as the tryptophan operon). Include in your description both the “on” and “off” states of the operon. Key elements of your diagram should include: Co-repressor, Genes, mRNA, Operator, Operon, Promoter, Repressor, RNA polymerase.