Domanda del libro di testo
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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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 2
Explain why Avery, MacLeod, and McCarty's in vitro transformation experiment showed that DNA, but not RNA or protein, is the hereditary molecule.
Guida verificata passo dopo passo1
span>Step 1: Understand the historical context of the experiment. Avery, MacLeod, and McCarty were building on Griffith's experiment, which showed that a 'transforming principle' could transfer genetic information between bacteria.
span>Step 2: Identify the main goal of the experiment. Avery, MacLeod, and McCarty aimed to determine the chemical nature of the 'transforming principle' that Griffith had discovered.
span>Step 3: Describe the experimental setup. They used heat-killed virulent Streptococcus pneumoniae bacteria and treated them with different enzymes to degrade specific macromolecules: DNase (to degrade DNA), RNase (to degrade RNA), and protease (to degrade proteins).
span>Step 4: Analyze the results. When the DNA was degraded by DNase, the transformation did not occur, meaning the non-virulent bacteria did not become virulent. However, when RNA or proteins were degraded, transformation still occurred.
span>Step 5: Conclude the findings. The experiment demonstrated that DNA is the hereditary molecule because only the destruction of DNA prevented the transformation, indicating that DNA was responsible for carrying genetic information.
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DNA as the Genetic Material
Avery, MacLeod, and McCarty's experiment demonstrated that DNA is the molecule responsible for heredity. They showed that when DNA from a virulent strain of bacteria was introduced to a non-virulent strain, the latter transformed into a virulent form, indicating that DNA carries the genetic instructions necessary for this transformation.
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09:32
History and Experiments
In Vitro Transformation
In vitro transformation refers to the process of introducing foreign DNA into a cell in a controlled environment outside of a living organism. In their experiment, the researchers isolated DNA from pathogenic bacteria and mixed it with non-pathogenic bacteria, observing that only the DNA could induce a change, thus supporting the idea that DNA is the hereditary material.
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05:48Transformation
Exclusion of RNA and Protein
Avery, MacLeod, and McCarty specifically tested the roles of RNA and protein by using enzymes that degraded these molecules before performing the transformation. Their results showed that the transformation did not occur when RNA or protein was destroyed, reinforcing the conclusion that DNA is the sole hereditary molecule responsible for the observed genetic change.
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05:05Proteins
Pratica correlata
Domanda del libro di testo
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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