Domanda del libro di testo
Explain why Avery, MacLeod, and McCarty's in vitro transformation experiment showed that DNA, but not RNA or protein, is the hereditary molecule.
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Ch. 7 - DNA Structure and Replication
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
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Capitolo 7, Problema 3
Hershey and Chase selected the bacteriophage T2 for their experiment assessing the role of DNA in heredity because T2 contains protein and DNA, but not RNA. Explain why T2 was a good choice for this experiment.
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Identify the components of the bacteriophage T2: T2 is composed of only DNA and protein, which makes it an ideal candidate for determining which of these molecules is responsible for heredity.
Understand the experimental design: Hershey and Chase used radioactive isotopes to label the DNA and protein of the T2 phages separately. They used phosphorus-32 (\(^{32}\text{P}\)) to label DNA, as DNA contains phosphorus, and sulfur-35 (\(^{35}\text{S}\)) to label protein, as proteins contain sulfur.
Consider the infection process: When T2 phages infect a bacterial cell, they inject their genetic material into the host. By observing which labeled component (DNA or protein) enters the bacterial cell, researchers can determine the hereditary material.
Analyze the results: After allowing the phages to infect bacteria, Hershey and Chase used a blender to separate the phage coats from the bacterial cells and then centrifuged the mixture. They found that \(^{32}\text{P}\) was present inside the bacterial cells, indicating that DNA was the material injected and responsible for heredity.
Conclude the significance: The experiment demonstrated that DNA, not protein, is the genetic material responsible for heredity in phages, providing strong evidence for DNA's role in genetic inheritance.
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Bacteriophage
Bacteriophages, or phages, are viruses that specifically infect bacteria. The T2 bacteriophage is composed of a protein coat and DNA, making it an ideal model for studying the genetic material responsible for heredity. Its simple structure allows researchers to easily manipulate and observe the effects of DNA versus protein in genetic transmission.
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06:04
Mapping Bacteriophages
DNA vs. Protein Hypothesis
The DNA vs. Protein hypothesis posits that DNA is the genetic material responsible for heredity, while proteins serve primarily structural and functional roles. Hershey and Chase aimed to determine which of these macromolecules carried genetic information. By using T2, they could effectively isolate and test the contributions of DNA and protein to heredity.
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05:05Proteins
Experimental Design
The experimental design of Hershey and Chase's study involved labeling the DNA and protein components of the T2 phage with radioactive isotopes. This allowed them to track which component entered the bacterial cells during infection. A well-structured experimental design is crucial for drawing valid conclusions about the role of DNA in heredity, as it minimizes confounding variables and enhances the reliability of results.
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05:48Transformation
Pratica correlata
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What results from the experiments of Frederick Griffith provided the strongest support for his conclusion that a transformation factor is responsible for heredity?
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Domanda del libro di testo
Explain how the Hershey and Chase experiment identified DNA as the hereditary molecule.
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Domanda del libro di testo
One strand of a fragment of duplex DNA has the sequence 5'-ATCGACCTGATC-3'.
What is the sequence of the other strand in the duplex?
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One strand of a fragment of duplex DNA has the sequence 5'-ATCGACCTGATC-3'.
What is the name of the bond that joins one nucleotide to another in the DNA strand?
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