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What experimental information verifies that certain codons in mRNA specify chain termination during translation?
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Ch. 13 - Translation and Proteins
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 13, Problema 1c
How do we know, based on studies of Neurospora nutritional mutations, that one gene specifies one enzyme?
Guida verificata passo dopo passo1
Understand the historical context: The studies on Neurospora crassa, a type of bread mold, were pivotal in establishing the 'one gene-one enzyme' hypothesis. These studies involved creating mutants that could not grow unless supplemented with specific nutrients, indicating a defect in a metabolic pathway.
Identify the nature of the mutations: Each nutritional mutant in Neurospora was found to lack the ability to synthesize a particular nutrient, suggesting that the mutation affected a specific step in a biochemical pathway.
Link mutations to enzyme function: By analyzing which nutrient the mutant could no longer produce, researchers inferred that the mutation disrupted the gene encoding the enzyme responsible for that step in the pathway.
Correlate gene mutation with enzyme deficiency: The key observation was that each mutation corresponded to the loss of a single enzyme activity, supporting the idea that one gene controls the production of one enzyme.
Summarize the conclusion: These findings collectively demonstrated that genes act as instructions for making enzymes, thereby establishing the principle that one gene specifies one enzyme.
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One Gene-One Enzyme Hypothesis
This hypothesis proposes that each gene encodes a single enzyme that affects a specific step in a metabolic pathway. It was formulated based on experiments showing that mutations in a gene correspond to the loss of a particular enzyme activity, linking genes directly to enzyme production.
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03:04
Modern Mapping
Neurospora Nutritional Mutants
Neurospora crassa mutants that cannot synthesize certain nutrients (auxotrophs) helped identify gene function. By growing mutants on minimal media supplemented with specific nutrients, researchers pinpointed which metabolic step was disrupted, revealing the gene’s role in producing a specific enzyme.
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10:48Mutations and Phenotypes
Metabolic Pathway Analysis
Studying the sequence of enzymatic reactions in metabolism allows scientists to map where mutations block the pathway. In Neurospora, each nutritional mutation blocked a single step, indicating that the corresponding gene encodes the enzyme catalyzing that step, supporting the one gene-one enzyme concept.
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02:48Chi Square Analysis
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