The lac operon is an operon that is: Group of answer choices A turned off whenever tryptophan is added to the growth medium. B permanently turned on. C turned on only when glucose is present in the growth medium. D turned off only when glucose is present in the growth medium. E turned on when lactose is present in the growth medium
Q: A mutation in the lac operator that prevents binding of the lac repressor to the operator
A: Lac operon The lac operon is a group of genes with a single promoter. It consists of three genes…
Q: Study the depiction of the lac operon in Figure 11.2. Normally, the genes are turned off when…
A: The lac operon contains three genes: lacZ, lacY, and lacA. These genes are transcribed as a single…
Q: Under which conditions does the trp repressor block transcription of the trp operon? when the…
A: The trp operon responds to a repressor protein that binds to two molecules of tryptophan. When the…
Q: What type of operon is arabinose operon? Dose the repressor bond when arabinose is I present or…
A: Introduction An operon is a functional segment of Dna that houses a collection of genes that are…
Q: Operons are a common feature of bacterial genomes. Which of the following statements about the lac…
A: Lac operon has three important genes that helps the bacteria to take up the lactose sugar when…
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: 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: 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: 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: In prokaryotes, the trp operon is under ________ that ________ prevents RNA polymerase from binding.…
A: Amino acids are required for bacteria like E. coli to sustain. E. coli can ingest tryptophan, which…
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: The lac operon is controlled by two main proteins. These proteins a. both act in a negative…
A: The lac (lactose) operon functions during the transcription and translation of genes required for…
Q: When lactose is first introduced into the medium, the lac operon is not induced and thus permease…
A: The lac operon in E.coli consists of 3 genes (lac Z, lac Y, lac A). The lac Z encodes beta…
Q: You can determine the regulation of an unknown operon based on descriptions like those in the table…
A: Introduction The expression of genes is highly regulated in both prokaryotes as well as in…
Q: You grow bacteria in media where the only carbon source is lactose (rich lactose media). Which of…
A: Introduction- Lysogen is defined as the strain of bacteria affected by a virus, i.e., a phage that…
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: You are growing E. coli in a laboratory in order to study their operons. The growth media you are…
A: 1. What effect does lactose have on the bacterial cell’s lac operon? Answer:- It induces the operon,…
Q: Match each of the following mechanisms with how it can change the levels of gene products--whether…
A: Operons are DNA segments that include groups of associated genes. They consist of a promoter region,…
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: Which of the following arabinose operon regulatory sites is exclusively involved in the repression…
A: Answer - Option B - ara O2
Q: The lac operon in E. coli bacteria codes for proteins that break down (digest) the disaccharide…
A: The lac operon is expressed at its highest levels when there is lactose but no glucose (Option C is…
Q: A cell has evolved in an environment that lacks a particular food source. However, when given this…
A: Lac operon: In E. coli and other enteric bacteria, the lactose operon (lac operon) is required for…
Q: A scientist has discovered a strain of bacteria that can convert ethanol to pyruvate when stimulated…
A: Solution 1) The repressor of this operon is functional It is active when ethanol is absent and…
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: 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: If E. coli bacteria are placed in an environment that contains both glucose and lactose, the…
A: operon are made up of various structural gene which are regulated by same promoter and operator.
Q: In the lac and trp operons, the repressors are said to be "allosteric molecules" because they…
A: Operator sequences are the sequences involved in the regulation of transcription, and activators or…
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: 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: A cell has evolved in an environment that lacks a particular food source. However, when given this…
A: Bacterial gene expression is control by dual mechanism. with our understanding of lac operon it…
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 tryptophan operon of E. coli represents an example of a gene regulatory system which is: a…
A: The trp operon, found in the bacterium Escherichia coli is a group of genes that encode biosynthetic…
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: If a particular operon encodes enzymes for making an essential amino acid is regulated like the trp…
A: The operon has five structural genes that code for the three enzymes required to convert chorismic…
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: 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: A transcription repressor results in a decrease in transcription of an operon. This is an example of…
A: The lac Operon is associated with Lactose metabolism. It comprises of the three structural genes -…
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 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: 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: A mutation at the operator prevents the regulator protein from binding.What effect will this…
A: An operon is defined as a group of genes that have a common promoter and regulator and also…
Q: In the lac operon, the lacZ gene codes for an enzyme called ____________, which catalyze the…
A: 1st blank: beta-galactosidase 2nd blank: Lactose
Q: E. coli is given lactose as a nutrient source. This results in the activation of the lac operon only…
A: The solution to the above mentioned questions is as follows:
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…
Q: A mutation at the operator prevents the regulator protein from binding.What effect will this…
A: Inducible operon has proteins that bind to repress or activate transcription. It depends on the…
The lac operon is an operon that is:
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- The tryptophan operon is a repressible operon that is A. transcribed only when glucose is present in the growth medium B. not transcribed whenever tryptophan is plentiful in the growth medium C. permanently turned on D. turned on only when tryptophan is present in the growth mediumThe lac operon is strongly transcribed when which of the following sugars are present in the growth medium? What is the correct option from the choices below? Lactose and glucose Lactose alone Lactose and arabinose a and b, but not c b and c, but not aRead the following statements about operons, and mark the FALSE one. O a. Prokaryotes use operons frequently because they are an efficient use of resources O b. The expression levels of the genes in an operon can be regulated individually Genes in an operon are placed next to each other (physically) O d. The genes in an operon share a single promoter
- The tryptophan (trp) operon is a repressible system. This means the genes are normally expressed, but the presence of trp can repress the operon the genes are normally repressed the genes are normally expressed when trp is present the genes are normally repressed, but the presence of trp can activate the genesWhich option is true when considering the regulation of cAMP and the Lac operon. If bacteria are in a medium containing low glucose, but suddenly glucose concentration in the medium increases by ten times, then we expect that cAMP...... a) Will increase inside the cell. b) Will not increase inside the cell.What type of operon is arabinose operon? Dose the repressor bond when arabinose is I present or absent in the medium? Indiuclr and absent Inaudible and present Repressible and absent Repressible and present A b c d which answer help asap
- Which of the following statements about the lactose operon in E. coli is TRUE? It contains the genes that encode the proteins for lactose metabolism. Its transcription is blocked when allolactose binds to the lac repressor. It contains a promoter, an operator and an attenuator. It is barely transcribed, when lactose is present in the medium and glucose is absent. It is transcribed at very high levels, when lactose is absent, and glucose is present.What are the effects of the following conditions on Lac operon of bacteria? 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 absentWhich of the following diagrams best models the regulation of the trp operon when tryptophan is present at high levels?
- 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 aboveThe lac operon has 4 genes, I, Z, Y and A. For each scenario, tell me the result of the mutation, what would happen if this mutant was in the presence of lactose and why. A) Lac I is mutated/not functional - B) Lac Y is mutated/not functional -What would occur if the repressor of an inducible operon were mutated so it could not bind the operator? Build up of a substrate wihin the pathway controlled by the operon Continuous transcription of the operon's genes Irreversible binding of the repressor to the promoter Reduced transcription of the operon's genes O O O O
