Domanda del libro di testo
Is attenuation the product of an allosteric effect? Is attenuation the result of a transcriptional or a translational activity? Explain your answers.
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Ch. 12 - Regulation of Gene Expression in Bacteria and Bacteriophage
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172
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TOC.tableOfContents
- Ch. 1 - The Molecular Basis of Heredity, Variation, and Evolution64
- Ch. 2 - Transmission Genetics144
- Ch. 3 - Cell Division and Chromosome Heredity81
- Ch. 4 - Gene Interaction87
- Ch. 5 - Genetic Linkage and Mapping in Eukaryotes103
- Ch. 6 - Genetic Analysis and Mapping in Bacteria and Bacteriophages73
- Ch. 7 - DNA Structure and Replication71
- Ch. 8 - Molecular Biology of Transcription and RNA Processing79
- Ch. 9 - The Molecular Biology of Translation110
- Ch. 10 - Eukaryotic Chromosome Abnormalities and Molecular Organization100
- Ch. 11 - Gene Mutation, DNA Repair, and Homologous Recombination86
- Ch. 12 - Regulation of Gene Expression in Bacteria and Bacteriophage90
- Ch. 13 - Regulation of Gene Expression in Eukaryotes38
- Ch. 14 - Analysis of Gene Function via Forward Genetics and Reverse Genetics72
- Ch. 15 - Recombinant DNA Technology and Its Applications69
- Ch. 16 - Genomics: Genetics from a Whole-Genome Perspective49
- Ch. 17 - Organelle Inheritance and the Evolution of Organelle Genomes27
- Ch. 18 - Developmental Genetics43
- Ch. 19 - Genetic Analysis of Quantitative Traits66
- Ch. 20 - Population Genetics and Evolution at the Population, Species, and Molecular Levels105
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172Non è quello che usi tu?Cambia libro di testo
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Sanders 3rd EditionCh. 12 - Regulation of Gene Expression in Bacteria and BacteriophageProblema 8
Sanders 3rd EditionCh. 12 - Regulation of Gene Expression in Bacteria and BacteriophageProblema 8Capitolo 12, Problema 8
The CAP binding site in the lac promoter is the location of positive regulation of gene expression for the operon. Identify what binds at this site to produce positive regulation, under what circumstances binding occurs, and how binding exerts a positive effect.
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Identify the molecule that binds to the CAP binding site: The molecule that binds to the CAP binding site is the catabolite activator protein (CAP), also known as cAMP receptor protein (CRP).
Determine the circumstances under which CAP binds to the site: CAP binds to the CAP binding site when it is complexed with cyclic AMP (cAMP). This occurs when glucose levels are low, leading to an increase in cAMP levels.
Explain how the binding of CAP-cAMP complex occurs: The CAP-cAMP complex binds to the CAP binding site located upstream of the lac operon promoter.
Describe the effect of CAP-cAMP binding on gene expression: The binding of the CAP-cAMP complex facilitates the binding of RNA polymerase to the promoter, enhancing the transcription of the lac operon genes.
Summarize the overall impact of CAP-cAMP binding: The positive regulation by CAP-cAMP ensures that the lac operon is expressed when glucose is scarce and lactose is available, allowing the cell to utilize lactose as an energy source.
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CAP Protein
The CAP (catabolite activator protein) is a transcription factor that binds to the CAP binding site in the lac promoter. This protein is crucial for the positive regulation of the lac operon, as it enhances the binding of RNA polymerase to the promoter, facilitating the transcription of genes involved in lactose metabolism.
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05:05
Proteins
cAMP Levels
Cyclic AMP (cAMP) is a signaling molecule that plays a vital role in the regulation of the lac operon. When glucose levels are low, cAMP levels rise, leading to the activation of CAP. The binding of cAMP to CAP is necessary for CAP to attach to the CAP binding site, thus promoting gene expression in the presence of lactose.
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07:01Lac Operon Summary
Positive Regulation
Positive regulation refers to the process by which a regulatory protein, such as CAP, increases the likelihood of transcription of a gene. In the case of the lac operon, when CAP binds to the CAP binding site in the presence of cAMP, it enhances RNA polymerase's affinity for the promoter, leading to increased transcription of the operon genes, especially when lactose is available.
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07:Positional Cloning
Pratica correlata
Domanda del libro di testo
What role does cAMP play in transcription of lac operon genes? What role does CAP play in transcription of lac operon genes?
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The transcription of -galactosidase and permease is inducible in lac⁺ bacteria with a wild-type lac operon. Explain the mechanism by which lactose gains access to the cell to induce transcription of the genes.
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Domanda del libro di testo
How would a cap⁻ mutation that produces an inactive CAP protein affect transcriptional control of the lac operon?
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Domanda del libro di testo
Explain the circumstances under which attenuation of operon gene expression is advantageous to a bacterial organism. Would you expect attenuation to be found in a single-celled eukaryote? In a multicelled eukaryote?
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Domanda del libro di testo
The trpL region contains four repeated DNA sequences that lead to the formation of stem-loop structures in mRNA. What are these stem-loop structures, and how do they affect transcription of the structural genes of the trp operon?
530
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