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What experimental information verifies that certain codons in mRNA specify chain termination during translation?
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Ch. 14 - Translation and Proteins
Klug12th EditionConcepts of GeneticsISBN: 9780135564776
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TOC.tableOfContents
- Ch. 1 - Introduction to Genetics17
- Ch. 2 - Mitosis and Meiosis36
- Ch. 3 - Mendelian Genetics51
- Ch. 4 - Extensions of Mendelian Genetics74
- Ch. 5 - Chromosome Mapping in Eukaryotes51
- Ch. 6 - Genetic Analysis and Mapping in Bacteria and Bacteriophages46
- Ch. 7 - Sex Determination and Sex Chromosomes33
- Ch. 8 - Chromosome Mutations: Variation in Number and Arrangement40
- Ch. 9 - Extranuclear Inheritance31
- Ch. 10 - DNA Structure and Analysis43
- Ch. 11 - DNA Replication and Recombination44
- Ch. 12 - DNA Organization in Chromosomes30
- Ch. 13 - The Genetic Code and Transcription54
- Ch. 14 - Translation and Proteins47
- Ch. 15 - Gene Mutation, DNA Repair, and Transposition41
- Ch. 16 - Regulation of Gene Expression in Bacteria29
- Ch. 17 - Transcriptional Regulation in Eukaryotes41
- Ch. 18 - Post-transcriptional Regulation in Eukaryotes33
- Ch. 19 - Epigenetics33
- Ch. 20 - Recombinant DNA Technology44
- Ch. 21 - Genomic Analysis36
- Ch. 22 - Applications of Genetic Engineering and Biotechnology36
- Ch. 23 - Developmental Genetics37
- Ch. 24 - Cancer Genetics34
- Ch. 25 - Quantitative Genetics and Multifactorial Traits54
- Ch. 26 - Population and Evolutionary Genetics45
Klug12th EditionConcepts of GeneticsISBN: 9780135564776Non è quello che usi tu?Cambia libro di testo
Capitolo 14, Problema 1a
What experimentally derived information led to Holley's proposal of the two-dimensional cloverleaf model of tRNA?
Guida verificata passo dopo passo1
Understand that Holley aimed to determine the nucleotide sequence of a specific tRNA molecule to reveal its structure and function.
Recognize that Holley and his team used enzymatic digestion and chemical methods to break down the tRNA into smaller fragments, which were then sequenced to determine the order of nucleotides.
Note that by overlapping these sequenced fragments, Holley was able to deduce the complete linear sequence of the tRNA molecule.
Observe that the sequence data revealed regions of complementary base pairing within the tRNA, suggesting the molecule folds back on itself to form double-stranded stems and single-stranded loops.
Conclude that this pattern of internal base pairing and loops led Holley to propose the two-dimensional cloverleaf model, where the tRNA has a characteristic secondary structure with distinct arms and loops.
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tRNA Structure and Function
Transfer RNA (tRNA) is a small RNA molecule that helps decode messenger RNA (mRNA) sequences into proteins by carrying specific amino acids to the ribosome during translation. Understanding its structure is crucial because it must interact with both mRNA and amino acids accurately.
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08:26
Functional Genomics
Nucleotide Sequencing and Base Pairing
Determining the exact sequence of nucleotides in tRNA allowed researchers to identify regions of complementary bases that could form intramolecular hydrogen bonds. This base pairing suggested a folded, two-dimensional structure rather than a simple linear chain.
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08:55Sequencing Overview
Holley's Experimental Evidence and the Cloverleaf Model
Holley used enzymatic digestion and chemical sequencing to map the nucleotide sequence of yeast alanine tRNA, revealing specific base-paired stems and loops. This data led him to propose the cloverleaf secondary structure, showing how tRNA folds into a stable shape essential for its function.
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