Textbook Question
Answer these questions concerning promoters.
Eukaryotic promoters are more variable than bacterial promoters. Explain why.
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Ch. 8 - Molecular Biology of Transcription and RNA Processing
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172
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Table of contents
- 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: 9780135564172Not the one you use?Change textbook
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Sanders 3rd EditionCh. 8 - Molecular Biology of Transcription and RNA ProcessingProblem 3b
Sanders 3rd EditionCh. 8 - Molecular Biology of Transcription and RNA ProcessingProblem 3bChapter 8, Problem 3b
Answer these questions concerning promoters.
What is the common structure of a bacterial promoter with respect to consensus sequences?
Verified step by step guidance1
Understand that a bacterial promoter is a DNA sequence that facilitates the binding of RNA polymerase to initiate transcription. Promoters are located upstream of the transcription start site.
Recognize that bacterial promoters typically contain two key consensus sequences: the -10 region (Pribnow box) and the -35 region. These sequences are named based on their approximate distance in base pairs upstream from the transcription start site (+1).
The -10 region consensus sequence is typically TATAAT. This sequence is important for the unwinding of DNA, as it is rich in adenine (A) and thymine (T), which are easier to separate due to having only two hydrogen bonds.
The -35 region consensus sequence is typically TTGACA. This sequence is recognized by the sigma factor of RNA polymerase, which helps the enzyme bind to the promoter.
Note that the spacing between the -10 and -35 regions is also important, usually around 16-18 base pairs. This spacing allows proper alignment of RNA polymerase for efficient transcription initiation.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Bacterial Promoter Structure
Bacterial promoters are specific DNA sequences located upstream of a gene that facilitate the binding of RNA polymerase for transcription initiation. They typically contain two key regions: the -10 region (Pribnow box) and the -35 region, which are recognized by sigma factors. The spacing between these regions is crucial for effective transcription initiation.
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Bacteria and Viral Chromosome Structure
Consensus Sequences
Consensus sequences are short, recurring patterns in DNA that are recognized by proteins, such as transcription factors. In bacterial promoters, the consensus sequences at the -10 and -35 regions represent the most common nucleotides found in these positions across different genes, providing a template for RNA polymerase binding and transcription regulation.
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08:55Sequencing Overview
Transcription Initiation
Transcription initiation is the process by which RNA polymerase binds to a promoter and begins synthesizing RNA from a DNA template. In bacteria, this process is highly regulated and relies on the interaction between the RNA polymerase, sigma factors, and the consensus sequences of the promoter, ensuring that genes are expressed at the right time and in the right amounts.
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Related Practice
Textbook Question
In one to two sentences each, describe the three processes that commonly modify eukaryotic pre-mRNA.
Textbook Question
Answer these questions concerning promoters.
What is the meaning of the term alternative promoter? How does the use of alternative promoters affect transcription?
Textbook Question
Answer these questions concerning promoters.
What consensus sequences are detected in the mammalian β-globin gene promoter?
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Textbook Question
Why are genes for rRNA and tRNA considered to be genes even though they do not produce polypeptides?
Textbook Question
Answer these questions concerning promoters. What role do promoters play in transcription?