Domanda del libro di testo
Telomeres are found at the ends of eukaryotic chromosomes. What is the sequence composition of telomeres?
515
views
Ch. 7 - DNA Structure and Replication
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172
Non è quello che usi tu?Cambia libro di testoScegli un libro di testo diverso
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
Capitolo 7, Problema 23
Why do the genomes of eukaryotes, such as Drosophila, need to have multiple origins of replication, whereas bacterial genomes, such as that of E. coli, have only a single origin?
Guida verificata passo dopo passo1
Eukaryotic genomes, such as those of Drosophila, are significantly larger and more complex than bacterial genomes, such as that of E. coli. This means that the total amount of DNA that needs to be replicated is much greater in eukaryotes.
Replication of DNA occurs at a specific site called the origin of replication. In bacteria like E. coli, the genome is circular and relatively small, so a single origin of replication is sufficient to replicate the entire genome efficiently within the time available for cell division.
In contrast, eukaryotic genomes are linear and consist of multiple chromosomes, each of which is much larger than a bacterial genome. If eukaryotes had only a single origin of replication per chromosome, the replication process would take an unreasonably long time to complete.
To ensure that the entire genome is replicated in a timely manner, eukaryotic chromosomes have multiple origins of replication. This allows replication to occur simultaneously at multiple sites, significantly speeding up the process.
The presence of multiple origins of replication in eukaryotes is also important for ensuring that replication is completed accurately and efficiently, as it reduces the risk of incomplete replication, which could lead to genomic instability or cell death.
Risposta video verificata per un problema simile:
Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
1mConcetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
Eukaryotic Genome Structure
Eukaryotic genomes, like those of Drosophila, are typically larger and more complex than prokaryotic genomes. They contain multiple linear chromosomes, which necessitate multiple origins of replication to ensure that DNA replication occurs efficiently and completely within the limited time of the cell cycle.
Video consigliato:
Percorso guidato
07:10
Chromosome Structure
Prokaryotic Genome Structure
Prokaryotic genomes, such as that of E. coli, are usually smaller and consist of a single circular chromosome. This simpler structure allows for a single origin of replication, which is sufficient to replicate the entire genome efficiently, as the replication process can proceed bidirectionally from that single point.
Video consigliato:
Percorso guidato
10:14Prokaryotic Transcription
DNA Replication Mechanism
DNA replication in both eukaryotes and prokaryotes involves the unwinding of the double helix and synthesis of new strands. However, eukaryotic cells require multiple origins of replication to manage the larger amount of DNA and to coordinate replication with cell division, while prokaryotes can complete replication from a single origin due to their streamlined genome.
Video consigliato:
Percorso guidato
11:59Steps to DNA Replication
Pratica correlata
Domanda del libro di testo
Raymond Rodriguez and colleagues demonstrated conclusively that DNA replication in E. coli is bidirectional. Explain why locating the origin of replication on one side of the circular chromosomes and the terminus of replication on the opposite side of the chromosome supported this conclusion.
440
views
Domanda del libro di testo
How does rolling circle replication differ from bidirectional replication?
823
views
Domanda del libro di testo
Joel Huberman and Arthur Riggs used pulse–chase labeling to examine the replication of DNA in mammalian cells. Briefly describe the Huberman–Riggs experiment, and identify how the results exclude a unidirectional model of DNA replication.
1053
views
Domanda del libro di testo
Bloom syndrome (OMIM 210900) is an autosomal recessive disorder caused by mutation of a DNA helicase. Among the principal symptoms of the disease are chromosome instability and a propensity to develop cancer. Explain these symptoms on the basis of the helicase mutation.
544
views
Domanda del libro di testo
Matthew Meselson and Franklin Stahl demonstrated that DNA replication is semiconservative in bacteria. Briefly outline their experiment and its results for two DNA replication cycles, and identify how the alternative models of DNA replication were excluded by the data.
725
views