Operon ap bio

Overview of operons, regulatory DNA sequences, & regulatory genes. Repressor & activator proteins. See more

Regulation of gene expression and cell specialization. The trp operon in E. Coli is a coordinately controlled set of genes involved in tryptophan biosynthesis. Tryptophan acts as a corepressor of the operon, which means it binds to and activates the trp repressor protein. This binding is more likely to occur when tryptophan is present at high ...Trp operon. The Trp operon plays a crucial role in tryptophan production, an essential amino acid. In E. Coli, the operon consists of genes and regulatory DNA sequences, including the promoter and operator. Tryptophan acts as a co-repressor, binding to the Trp repressor and inhibiting transcription when abundant. Science Quiz review. 6 terms. carter_campbell640. Preview. Study with Quizlet and memorize flashcards containing terms like the lac operon..., in the lac operon, under which of the following conditions will the lac genes be transcribed at high levels?, rna polymerase binds to the: and more. Unit 6 Test (AP Bio) In a transformation experiment, a sample of E. coli bacteria was mixed with a plasmid containing the gene for resistance to the antibiotic ampicillin (ampr). Plasmid was not added to a second sample. Samples were plated on nutrient agar plates, some of which were supplemented with the antibiotic ampicillin.5.0 (2 reviews) 1. A (n) (operonis) a stretch of DNA consisting of an operator, a promoter, and genes for a related set of proteins, usually making up an entire metabolic pathway. 2. The (genes of an operon) is/are arranged sequentially after the promoter. 3.plasmid. independently replicating segment of circular DNA that occurs naturally in bacteria; ex: pGlo. Components of pGlo. gene for GFP derived from bioluminescent jellyfish, bla gene that codes for beta-lactamase and inactivates ampicillin, gene for araC protein that regulates GFP transcription (turns on GFP if arabinose is present) Operon.Name: _____ Lac Operon AP Biology PhET Simulation The goal of this simulation is to help you understand how prokaryotes (note that this is for prokaryotes and NOT eukaryotes) control gene expression. Specifically, this activity will simulate an inducible operon called the lac operon used to control the expression of genes that control … operator. a segment of DNA in the promoter region that acts as an on or off "switch". repressor. a protein that binds to the operator to switch the operon off. inducer. inactivates the repressor (turns on the operon) regulatory gene. codes for the production of the repressor protein and is found upstream of the operon.

Use these models as props during class, when discussing the operon hypothesis. Have pairs of students use the props as they simulate and narrate the process of repressing or inducing an operon to regulate the genes. Make sure everyone has a chance to run through a simulation with each operon. AP® Biology Daily Lesson PlansFind other quizzes for Biology and more on Quizizz for free! AP - Chapter 13 - Regulation of Gene Expression quiz for 11th grade students. ... In the lac operon, the genes within the operon will be expressed if: lactose is absent in the cell. lactose is present in the cell. 8. Multiple Choice. Edit. 30 seconds. 1 pt.An operon is a set of genes grouped together, transcribed together with one promoter for one function (we think). At the essential level, operons consist of a promoter, operator, and coding genes. ÆPromoter site- Sequence of DNA where RNA Polymerase binds for transcription. This is the beginning of a gene.Ap Biology Operon Essay Writing. 435. Customer Reviews. Meeting. Deadlines. 1 (888)499-5521. 1 (888)814-4206.Operator Definition. An operator is a genetic sequence which allows proteins responsible for transcription to attach to the DNA sequence. The gene, or genes, which get transcribed when the operator is bound are known as the operon. Repressor proteins, which bind to the gene operator, can block transcription factors from binding to the operator.Build a gene network! The lac operon is a set of genes which are responsible for the metabolism of lactose in some bacterial cells. Explore the effects of mutations within the lac operon by adding or removing genes from the DNA. a specific nucleotide sequence in DNA that binds RNA polymerase, positioning it to start transcribing RNA at the appropriate place, when repressor binds to operator-RNA polymerase can't bind to promoter so no gene transcription. inducible operon system. usually off but can be stimulated when a specific small molecule interacts with a regulatory ... 100% Success rate. The narration in my narrative work needs to be smooth and appealing to the readers while writing my essay. Our writers enhance the elements in the writing as per the demand of such a narrative piece that interests the readers and urges them to read along with the entire writing. View Sample. Perfect Essay. #5 in Global Rating.

An operon: a set of genes transcribed and controlled as a single unit. ... [q json=”true” yy=”4″ unit=”6.Gene_Expression_and_Regulation” dataset_id=”AP_Bio_Flashcards_2022|1853a962b3510″ question_number=”235″ topic=”6.5.Regulation_of_Gene_Expression”] Explain the difference between an …3) DNA fragments are mixed together, matching sticky ends base-pair with each other. 4) DNA ligase seals the base-paired DNA fragments. Cloning vector. the original plasmid carrying the genes. Cloning genes in bacterial plasmids/bacterial transformation. -foreign DNA inserted into a plasmid.AP Biology Unit 6 Test. 65 terms. theCirame. Preview. AP Bio Ch. 20. 23 terms. Sierra_Aguilar4. Preview. BIO286 EXAM 2 VOCAB - Spring 2024. 177 terms. Jaimejones_wchs. Preview. ... The operon prevents transcription of trytophan, but will only bind to the DNA in presence of high levels. 6. What turns the "switch" off and how? Study with Quizlet and memorize flashcards containing terms like What result would occur if the repressor of an inducible operon were mutated so that it could not bind the operator?, If a researcher moves the repressor gene (lacI), along with its promoter, to a position at some several thousand base pairs away from its normal position, what result would be expected?, What molecule is a protein ... The College Board. The College Board is a not-for-profit membership association whose mission is to connect students to college success and opportunity. Founded in 1900, the association is composed of more than 5,700 schools, colleges, universities and other educational organizations. Each year, the College Board serves seven million students ...

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What are operons? What do I need to know about operons for the AP® Bio exam? In this video, we'll cover Prokaryotic Gene Regulation, the difference between i... In bacteria, related genes are regulated and expressed together in a structure known as an operon. A single mRNA strand transcribed from an operon can synthesize multiple proteins. The lac operon encodes for enzymes needed to utilize lactose as an energy source ( LacZ, LacY, LacA ).In the competitive world of real estate, it’s crucial for agents to find ways to stand out from the crowd. One effective way to do this is by crafting an engaging and informative b...The pyruvate dehydrogenase complex (PDC) catalyzes the conversion of pyruvate to acetyl-CoA, a substrate for the Krebs (citric acid) cycle. The rate of pyruvate conversion is greatly reduced in individuals with PDC deficiency, a rare disorder. (a) Identify the cellular location where PDC is most active.Lac Operon AP Biology PhET Simulation. The goal of this simulation is to help you understand how prokaryotes (note that this is for prokaryotes and NOT. eukaryotes) control gene expression. Specifically, this activity will simulate an inducible operon called the lac operon. used to control the expression of genes that control lactose levels in ...

AP Biology: Chapters 18. Why are all genes not "on" all the time? (e.g. E. Coli) Click the card to flip 👆. E.Coli live in very fickle environments. If an E. Coli in the human gut is lacking an amino acid, it will turn the gene that makes it "on." If the human ate a meal rich in that amino acid, it turns that gene "off", an doesn't us up ... 5.0 (2 reviews) 1. A (n) (operonis) a stretch of DNA consisting of an operator, a promoter, and genes for a related set of proteins, usually making up an entire metabolic pathway. 2. The (genes of an operon) is/are arranged sequentially after the promoter. 3.Name: _____ Lac Operon AP Biology PhET Simulation The goal of this simulation is to help you understand how prokaryotes (note that this is for prokaryotes and NOT eukaryotes) control gene expression. Specifically, this activity will simulate an inducible operon called the lac operon used to control the expression of genes that control …Study with Quizlet and memorize flashcards containing terms like how does the binding of the trp corepressor and the lac inducer to their respective repressor proteins alter repressor function and transcription in each case?, describe the binding of RNA polymerase, repressors, and activators of the lac operon when both lactose and glucose are scarce. … plasmid. independently replicating segment of circular DNA that occurs naturally in bacteria; ex: pGlo. Components of pGlo. gene for GFP derived from bioluminescent jellyfish, bla gene that codes for beta-lactamase and inactivates ampicillin, gene for araC protein that regulates GFP transcription (turns on GFP if arabinose is present) Operon. The lac operon is an inducible operon that encodes enzymes for metabolism of the sugar lactose. It turns on only when the sugar lactose is present (and other, preferred sugars are absent). The inducer in this case is allolactose, a modified form of lactose. The TRP Operon (Repressible Operon) Usually "on," but can be turned "off" by a small ...The operon includes a regulatory gene that codes for a repressor protein that binds to the operator, which prevents RNA polymerase from transcribing the gene(s) of interest. ... Information presented and the examples highlighted in the section support concepts outlined in Big Idea 3 of the AP ® Biology Curriculum Framework.Study with Quizlet and memorize flashcards containing terms like 61. What does the operon model attempt to explain? a. the coordinated control of gene expression in bacteria b. bacterial resistance to antibiotics c. how genes move between homologous regions of DNA d. the mechanism of viral attachment to a host cell e. horizontal transmission of plant viruses, 62. The tryptophan operon is a ...In this video Paul Andersen describes the elements of an operon. The promoter allows the RNA polymerase to transcribe the required genes. The operator and repressor regulate the expression of the genes by blocking the RNA polymerase. Unit 6 Test (AP Bio) In a transformation experiment, a sample of E. coli bacteria was mixed with a plasmid containing the gene for resistance to the antibiotic ampicillin (ampr). Plasmid was not added to a second sample. Samples were plated on nutrient agar plates, some of which were supplemented with the antibiotic ampicillin. The AP Biology exam used to consist of eight long-form free response questions, but in 2019 it was redesigned to consist of only six free response questions. Two of those questions are in the “short” form, and these consist of 50% of the free response score, or 25% of your total score. Long story short, those four questions may not be as ...Operons. An operon is a sequence of DNA containing a cluster of genes under the control of a single promoter. Hence, genes within an operon will always be expressed together or not at all (their expression patterns are linked) There are three basic components to an operon. Promoter – Upstream sequence to which RNA polymerase binds.

1. Multiple Choice. what is an operon? 2. Multiple Choice. 3. Multiple Choice. Already have an account? AP Biology Chapter 18 part 1 quiz for 12th grade students.

These types of questions have become more and more common on the AP exam, so it is important to feel comfortable and confident with them. 2023 #6 (data analysis) 2023 #3. 2022 #3 (experiment design) 2021 #1. 2020 #1 parts c-e. Correct answer: Restriction endonucleases. Explanation: Restriction Endonucleases, or otherwise known as restriction enzymes, allows biologist to “cut and paste” different DNA sequences together. The use of restriction endonucleases is critical for the creation of recombinant plasmids. A corepressor is, by definition, In the field of molecular biology, "a substance that inhibits the expression of genes. In prokaryotes, corepressors are small molecules whereas in eukaryotes, corepressors are proteins." In the case of E. coli, the corepressor is the Tryptophan. Compare and contrast an inducible operon and a repressible operon. Created by D. LaFleur. Name: Lac Operon AP Biology PhET Simulation. The goal of this simulation is to help you understand how prokaryotes (note that this is for prokaryotes and NOT. eukaryotes) control gene expression. Specifically, this activity will simulate an inducible operon called the lac operon. used to control the expression of genes ... PhET SimulationGene Machine: The Lac Operonhttp://phet.colorado.edu/en/simulation/gene-machine-lac-operonIn this video Paul Andersen describes the elements o...Key points: The lac operon of E. coli contains genes involved in lactose metabolism. It's expressed only when lactose is present and glucose is absent. Two regulators turn the operon "on" and "off" in response to lactose and glucose levels: the lac repressor and catabolite activator protein (CAP). The lac repressor acts as a lactose sensor.As with many AP Biology free response, these topics are often intertwined with other topics. It seems that the time is due to have an “all ... An operon is a set of genes grouped together, transcribed together with one promoter for one function (we think). At the essential level, operons consist of a promoter, operator, and coding genes. ...A bio poem is a biography in the form of a poem that follows a strict form with 11 lines, each listing specific characteristics about a person. Bio poems are used frequently in int...AP Bio Operons. Andrea Stonebraker. 1.3K. plays. 15 questions. Copy & Edit. Show Answers. See Preview. 1. Multiple Choice. 30 seconds. 1 pt. Which molecule can we find …

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A The presence of excess lactose blocks the functioning of RNARNA polymerase in this operon. B When bound to the operator, the repressor protein prevents lactose metabolism in E. coli. C The binding of the repressor protein to the operator enables E. coli to metabolize lactose. ... ap bio quiz 6.7-6.8 mutations and biotechnology. 12 terms ...Created by D. LaFleur. Name: Lac Operon AP Biology PhET Simulation. The goal of this simulation is to help you understand how prokaryotes (note that this is for prokaryotes and NOT. eukaryotes) control gene expression. Specifically, this activity will simulate an inducible operon called the lac operon. used to control the expression of genes ...Study with Quizlet and memorize flashcards containing terms like 1.Explain the role of each of the following in protein synthesis in eukaryotic cells. • RNA polymerase • Spliceosomes (snRNPs) • Codons • Ribosomes • tRNA, 2. (a) Explain how ligand A and ligand B can cause identical cellular responses in a cell. (b) Predict the most likely effect of a two …Glucose absent, lactose absent: No transcription of the lac operon occurs. cAMP levels are high because glucose levels are low, so CAP is active and will be bound to the DNA. However, the lac repressor will also be bound to the operator (due to the absence of allolactose), acting as a roadblock to RNA polymerase and preventing transcription.Study with Quizlet and memorize flashcards containing terms like If a particular operon encodes enzymes for making an essential amino acid is regulated like the trp operon, then a. the animo acid inactivates the repressor b. the enzymes produced are called inducible enzymes c. the repressor is active in the absence of the animo acid. d. the amino acid …Bigfoot or an Ancient Ape? - Sasquatch researchers have no conclusive evidence that sasquatches exist. Learn about scientific explanations for the sasquatch, like the gigantopithec...a cell surface protein on cell 4 signals cell 3 to induce formation of the worm's intestine. Identify which of the following best describes purines and pyrimidines. purines (A, G) have a double ring, pyrimidines (C,T, U) have a single ring. Humans have a diploid number (2n) of 46. Which of the following statements best predicts the consequences ...Hallux valgus, commonly known as bunions, can be a painful condition that affects many women. One way to alleviate the discomfort and prevent further complications is by wearing th... ….

Tumor-suppressor genes help prevent uncontrolled cell growth. One that is found mutated (and therefore nonfunctional) in more than 50% of human cancer is p53. So important is the p53. gene that it is sometimes called the “guardian angel of the genome.”. Describe the double whammy that results from mutation of p53.usually turned off such as lactose operon. copresssor. turns tryptophan operon off. inducer. turns on lactose operon. negative control. regulatory protein turns off the gene transcription. ... AP Biology Chapter 18 Gene Expression. 81 terms. JohnGeringer3. Sets found in the same folder. Chapter 18 questions Flashcards | Quizlet. AP Bio. Chapter 18 questions. This chapter contains a lengthy discussion of the trp operon involved in regulating the synthesis of tryptophan. In the case of E. coli, the bacterium may need to synthesize tryptophan, or its host, a human, may supply all the tryptophan it needs. Think back to Chapter 17. Study with Quizlet and memorize flashcards containing terms like Lac Operon, Promoter, Operator and more. ... AP Biology. 80 terms. kaleesha_mull. Preview. Biology Root Words 7. 10 terms. avas249. Preview. Bio 1610 exam 2 . 233 terms. j4s_ Preview. pelvis pp6 development non labeling. 106 terms. jgburton1994. Preview. Biology- unit 2 test . Guaranteed 4 or 5 in AP Bio! Free trial at Learn-Biology.com/student-free-trial In this musical lecture, Mr. W teaches (in rap!) about the trp and lac operon... If you are a teacher or student who is interested in a notes handout/worksheet that pairs with this video, check it out here: https://www.teacherspayteachers...Tumor-suppressor genes help prevent uncontrolled cell growth. One that is found mutated (and therefore nonfunctional) in more than 50% of human cancer is p53. So important is the p53. gene that it is sometimes called the “guardian angel of the genome.”. Describe the double whammy that results from mutation of p53.The lac operon found in some bacteria is one of the most well-known of these. The lac operon controls the production of the enzyme lactase (also called β-galactosidase) and two other structural proteins. Lactase breaks down the substrate lactose so that it can be used as an energy source in the bacterial cell.Dec 31, 2020 · If you are a teacher or student who is interested in a notes handout/worksheet that pairs with this video, check it out here: https://www.teacherspayteachers... Operon ap bio, Lac operon. - Genes code for enzymes that help to break down lactose. - It is an inducible operon, meaning it is always off. - If lactose is added number of enzymes increase. - Regulatory gene, LAC 1, codes for an allosteric repressor protein. - Lac repressor is already active, inhibiting the lactose genes. - An inducer deactivates the repressor,, Lac Operon AP Biology PhET Simulation. The goal of this simulation is to help you understand how prokaryotes (note that this is for prokaryotes and NOT. eukaryotes) control gene expression. Specifically, this activity will simulate an inducible operon called the lac operon. used to control the expression of genes that control lactose levels in ..., In the competitive world of real estate, it’s crucial for agents to have a strong online presence. One of the most important aspects of this is crafting an engaging agent bio. Your..., The trp operon, found in E. coli bacteria, is a group of genes that encode biosynthetic enzymes for the amino acid tryptophan. The trp operon is expressed (turned "on") when …, dinas0308. Preview. Biology: DNA technologies. 9 terms. Brooke_Krehbiel4. Preview. Study with Quizlet and memorize flashcards containing terms like repression, increase/decrease rate of initiation, negative and more. , Study with Quizlet and memorize flashcards containing terms like operon, operator (in an operon), promoter and more. ... ap bio chapter 24 ap classroom. 22 terms. kileyjohnson2. Preview. AP Bio 6.5-6.8 study guide. 27 terms. plg_22. Preview. Charles Darwin's Discoveries. 30 terms. samgefen7., 2. Pre-packeged m-RNA in egg came from egg doner. 3. Nuclear doner was 6 thus had 6 years of mutations that were in the utter that may not have been in other cells. 4. dolly started with shorter telomeres. 5. raised in different environment. 6. different conditions while in womb. Some cells can become ANY type of cell, some can become many ..., Bigfoot or an Ancient Ape? - Sasquatch researchers have no conclusive evidence that sasquatches exist. Learn about scientific explanations for the sasquatch, like the gigantopithec..., Lac Operon AP Biology PhET Simulation. The goal of this simulation is to help you understand how prokaryotes (note that this is for prokaryotes and NOT. eukaryotes) control gene expression. Specifically, this activity will simulate an inducible operon called the lac operon. used to control the expression of genes that control lactose levels in ..., lac Operon. inducible operon-normally "off" can be activated (induced)-Catabolic pathwayIf lactose is present, transcription starts.- once all lactose is catabolized, transcription stops. Study with Quizlet and memorize flashcards containing terms like Operons, How many promotors are needed for all genes in the unit?, regulatory proteins and more., Lesson 6: Gene Regulation—the Operon Model ... Sample AP Biology Exam questions pertaining to the module are also included. 3 Prerequisite Knowledge Biochemistry Understanding biological processes at the molecular level allows students to study biology at a deeper, more conceptual level. The relationship between structure and function (a key, In the competitive world of real estate, it’s crucial for agents to find ways to stand out from the crowd. One effective way to do this is by crafting an engaging and informative b..., 1. The diagram illustrates the lac operon. The top picture shows the operon in the absence of lactose and the bottom picture shows the operon in the presence of lactose. What is the green shape, labeled “2”? a. Repressor b. Promoter c. RNA polymerase d. Operator 2. What type of operon does this portray? a. Repressible b. Inducible c. Co ..., 100% Success rate. The narration in my narrative work needs to be smooth and appealing to the readers while writing my essay. Our writers enhance the elements in the writing as per the demand of such a narrative piece that interests the readers and urges them to read along with the entire writing. View Sample. Perfect Essay. #5 in Global Rating., Study with Quizlet and memorize flashcards containing terms like 61. What does the operon model attempt to explain? a. the coordinated control of gene expression in bacteria b. bacterial resistance to antibiotics c. how genes move between homologous regions of DNA d. the mechanism of viral attachment to a host cell e. horizontal transmission of plant viruses, 62. The tryptophan operon is a ..., Glucose absent, lactose absent: No transcription of the lac operon occurs. cAMP levels are high because glucose levels are low, so CAP is active and will be bound to the DNA. However, the lac repressor will also be bound to the operator (due to the absence of allolactose), acting as a roadblock to RNA polymerase and preventing transcription. , AP Bio Unit 4 . 19 terms. Guirguis_tina. Preview. Control of Gene Expression: Eukaryotes . 40 terms. Natalie_Northouse. Preview. Chapter 18. 76 terms. Hannah6849. Preview. Chapter 18. 99 terms. ... Operon Model. one mechanism for control of gene expression in bacteria. Natural selection has favored bacteria., Science Quiz review. 6 terms. carter_campbell640. Preview. Study with Quizlet and memorize flashcards containing terms like the lac operon..., in the lac operon, under which of the following conditions will the lac genes be transcribed at high levels?, rna polymerase binds to the: and more., An example of an operon is the lac operon, which is responsible for the metabolism of lactose in bacteria. 🦠. The lac operon is an example of an inducible system, which means that the expression of the genes in the operon is increased in the presence of the inducer, lactose., Transcript. DNA regulation controls gene expression in cells, allowing different cell types to perform unique functions despite having the same DNA. Prokaryotes, like bacteria, use operons, which consist of a promoter and multiple genes. Repressors, corepressors, activators, and inducers can influence transcription by binding to regulatory DNA ..., Science Quiz review. 6 terms. carter_campbell640. Preview. Study with Quizlet and memorize flashcards containing terms like the lac operon..., in the lac operon, under which of the following conditions will the lac genes be transcribed at high levels?, rna polymerase binds to the: and more., AP Biology Operon Definitions Flashcards | Quizlet. Diagram of Operon. Click the card to flip 👆. In genetics, an operon is a functioning unit of genomic DNA containing a cluster of …, Unit 6 Test (AP Bio) In a transformation experiment, a sample of E. coli bacteria was mixed with a plasmid containing the gene for resistance to the antibiotic ampicillin (ampr). Plasmid was not added to a second sample. Samples were plated on nutrient agar plates, some of which were supplemented with the antibiotic ampicillin., AP Biology Unit 6 MCQ. 24 terms. I_am_failing. Preview. Ap unit 6. 25 terms. Nailah1236. Preview. Unit 3 - Cell Membrane through Energy. 25 terms. bd6002730. ... The trp operon in E. coli is an example of a repressible operon that consists of genes coding for enzymes used to synthesize tryptophan. When tryptophan levels are high, the operon is ..., Regulation of gene expression and cell specialization. The trp operon in E. Coli is a coordinately controlled set of genes involved in tryptophan biosynthesis. Tryptophan acts as a corepressor of the operon, which means it binds to and activates the trp repressor protein. This binding is more likely to occur when tryptophan is present at high ..., The trp operon, found in E. coli bacteria, is a group of genes that encode biosynthetic enzymes for the amino acid tryptophan. The trp operon is expressed (turned "on") when …, 2. Pre-packeged m-RNA in egg came from egg doner. 3. Nuclear doner was 6 thus had 6 years of mutations that were in the utter that may not have been in other cells. 4. dolly started with shorter telomeres. 5. raised in different environment. 6. different conditions while in womb. Some cells can become ANY type of cell, some can become many ..., Jun 8, 2018 ... Operons generally occur in bacterial genomes and are sets of genes that perform a biological function like metabolizing lactose. When the ..., Binds to the operator and blocks RNA polymerase from making mRNA. Give the fuction of RNA polymerase. Reads the gene and makes mRNA for translation. Study with Quizlet and memorize flashcards containing terms like What is an inducible operon?, Give an example of an inducible operon, Lac is short for the disaccharide called _______. and more. , Guaranteed 4 or 5 in AP Bio! Free trial at Learn-Biology.com/student-free-trial In this musical lecture, Mr. W teaches (in rap!) about the trp and lac operon..., AP Biology Unit 6 Test. 65 terms. theCirame. Preview. AP Bio Ch. 20. 23 terms. Sierra_Aguilar4. Preview. BIO286 EXAM 2 VOCAB - Spring 2024. 177 terms. Jaimejones_wchs. Preview. ... The operon prevents transcription of trytophan, but will only bind to the DNA in presence of high levels. 6. What turns the "switch" off and how?, AP BIO UNIT 6 FRQ. 8 terms. abbyconsiglio134. Preview. Ap Bio: Unit 7 Progress Check: MCQ. 25 terms. Rachel4635. Preview. Biology Chapter 1. 5 terms. selenaamercado24. ... The trp operon in E. coli is an example of a repressible operon that consists of genes coding for enzymes used to synthesize tryptophan. When tryptophan levels are high, the ..., plasmid. independently replicating segment of circular DNA that occurs naturally in bacteria; ex: pGlo. Components of pGlo. gene for GFP derived from bioluminescent jellyfish, bla gene that codes for beta-lactamase and inactivates ampicillin, gene for araC protein that regulates GFP transcription (turns on GFP if arabinose is present) Operon.