Domanda del libro di testo
What observations are consistent with the conclusion that DNA serves as the genetic material in eukaryotes? List and discuss them.
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Ch. 9 - DNA Structure and Analysis
Klug10th EditionEssentials of GeneticsISBN: 9780135588789
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TOC.tableOfContents
- Ch. 1 - Introduction to Genetics16
- Ch. 2 - Mitosis and Meiosis28
- Ch. 3 - Mendelian Genetics37
- Ch. 4 - Modification of Mendelian Ratios53
- Ch. 5 - Sex Determination and Sex Chromosomes32
- Ch. 6 - Chromosome Mutations: Variation in Number and Arrangement37
- Ch. 7 - Linkage and Chromosome Mapping in Eukaryotes36
- Ch. 8 - Genetic Analysis and Mapping in Bacteria and Bacteriophages24
- Ch. 9 - DNA Structure and Analysis38
- Ch. 10 - DNA Replication29
- Ch. 11 - Chromosome Structure and DNA Sequence Organization22
- Ch. 12 - The Genetic Code and Transcription36
- Ch. 13 - Translation and Proteins27
- Ch. 14 - Gene Mutation, DNA Repair, and Transposition34
- Ch. 15 - Regulation of Gene Expression in Bacteria22
- Ch. 16 - Regulation of Gene Expression in Eukaryotes37
- Ch. 17 - Recombinant DNA Technology27
- Ch. 18 - Genomics, Bioinformatics, and Proteomics30
- Ch. 19 - The Genetics of Cancer21
- Ch. 20 - Quantitative Genetics and Multifactorial Traits37
- Ch. 21 - Population and Evolutionary Genetics45
Klug10th EditionEssentials of GeneticsISBN: 9780135588789Non è quello che usi tu?Cambia libro di testo
Capitolo 9, Problema 7
Does the design of the Hershey–Chase experiment distinguish between DNA and RNA as the molecule serving as the genetic material? Why or why not?
Guida verificata passo dopo passo1
Step 1: Understand the goal of the Hershey–Chase experiment, which was to determine whether DNA or protein is the genetic material in bacteriophages (viruses that infect bacteria).
Step 2: Review the experimental design: Hershey and Chase used two different radioactive isotopes to label the components of the phage. They labeled DNA with radioactive phosphorus-32 (\(^{32}P\)) because DNA contains phosphorus, and they labeled protein with radioactive sulfur-35 (\(^{35}S\)) because proteins contain sulfur but DNA does not.
Step 3: Analyze what happens during the experiment: After allowing the labeled phages to infect bacteria, they used a blender to separate the phage protein coats from the bacterial cells and then measured radioactivity in the bacteria and in the phage coats.
Step 4: Consider whether the experiment distinguishes DNA from RNA: Since the radioactive label for nucleic acids was phosphorus-32, which labels all nucleic acids (both DNA and RNA contain phosphorus), the experiment does not specifically distinguish DNA from RNA. It only distinguishes nucleic acids from proteins.
Step 5: Conclude that the Hershey–Chase experiment demonstrated that nucleic acids (DNA or RNA) enter the bacterial cells and carry genetic information, but it does not differentiate between DNA and RNA as the genetic material. Additional evidence was needed to confirm that DNA, not RNA, is the genetic material.
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Hershey–Chase Experiment Design
The Hershey–Chase experiment used bacteriophages labeled with radioactive isotopes to track DNA and protein during infection. Phosphorus-32 labeled DNA, while sulfur-35 labeled protein, allowing researchers to determine which molecule entered bacterial cells. This design specifically tested DNA versus protein, not RNA.
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Percorso guidato
08:06
Mendel's Experiments
Distinction Between DNA and RNA
DNA and RNA are both nucleic acids but differ chemically; DNA contains deoxyribose sugar, while RNA contains ribose. The Hershey–Chase experiment did not differentiate between DNA and RNA because it only labeled DNA with phosphorus-32, assuming DNA was the nucleic acid present in phages, not considering RNA as genetic material.
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Identification of Genetic Material
The experiment demonstrated that DNA, not protein, entered bacterial cells and directed viral replication, supporting DNA as the genetic material. However, it did not explicitly rule out RNA because RNA was not labeled or tested, so the experiment distinguished DNA from protein but not DNA from RNA.
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Percorso guidato
09:32History and Experiments
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