Domanda del libro di testo
What evidence did Watson and Crick have at their disposal in 1953? What was their approach in arriving at the structure of DNA?
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Ch. 10 - DNA Structure and Analysis
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 10, Problema 14
Describe the various characteristics of the Watson–Crick double-helix model for DNA.
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Start by explaining that the Watson–Crick model describes DNA as a double helix, which means it consists of two strands twisted around each other in a spiral shape.
Describe the backbone of each DNA strand, which is made up of alternating sugar (deoxyribose) and phosphate groups, connected by phosphodiester bonds.
Explain that the two strands run in opposite directions, meaning they are antiparallel; one strand runs 5' to 3' and the other runs 3' to 5'.
Discuss the base pairing rules: adenine (A) pairs with thymine (T) via two hydrogen bonds, and guanine (G) pairs with cytosine (C) via three hydrogen bonds, which stabilizes the double helix.
Mention that the bases are located on the inside of the helix, stacked like steps of a spiral staircase, while the sugar-phosphate backbones form the outside, and that the helix has a major and minor groove important for protein binding.
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Structure of the Double Helix
The Watson–Crick model describes DNA as two antiparallel strands twisted into a right-handed double helix. Each strand consists of a sugar-phosphate backbone with nitrogenous bases projecting inward, forming the helical shape essential for DNA's stability and function.
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06:25
DNA Structure
Base Pairing Rules
In the double helix, nitrogenous bases pair specifically: adenine (A) pairs with thymine (T) via two hydrogen bonds, and guanine (G) pairs with cytosine (C) via three hydrogen bonds. This complementary base pairing ensures accurate DNA replication and genetic information storage.
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03:49Base Distortions
Antiparallel Orientation
The two DNA strands run in opposite directions, one 5' to 3' and the other 3' to 5'. This antiparallel arrangement is crucial for enzymatic processes like replication and transcription, allowing enzymes to read and synthesize DNA efficiently.
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05:05Proteins
Pratica correlata
Domanda del libro di testo
How do covalent bonds differ from hydrogen bonds? Define base complementarity.
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Domanda del libro di testo
Adenine may also be named 6-amino purine. How would you name the other four nitrogenous bases, using this alternative system? (O is indicated by 'oxy-,' and CH₃ by 'methyl.')
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Domanda del libro di testo
What might Watson and Crick have concluded had Chargaff's data from a single source indicated the following?
Why would this conclusion be contradictory to Wilkins's and Franklin's data?
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Domanda del libro di testo
How are the carbon and nitrogen atoms of the sugars, purines, and pyrimidines numbered?
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Domanda del libro di testo
Draw the chemical structure of a dinucleotide composed of A and G. Opposite this structure, draw the dinucleotide composed of T and C in an antiparallel (or upside-down) fashion. Form the possible hydrogen bonds.
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