Textbook Question
How did Kornberg assess the fidelity of DNA polymerase I in copying a DNA template?
Ch. 11 - DNA Replication and Recombination
Klug12th EditionConcepts of Genetics ISBN: 9780135564776
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Table of contents
- 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
Chapter 11, Problem 6
What are the requirements for in vitro synthesis of DNA under the direction of DNA polymerase I?
Verified step by step guidance1
Understand that DNA polymerase I requires a template strand of DNA to guide the synthesis of the new DNA strand, so the first requirement is a single-stranded DNA template.
Recognize that DNA polymerase I cannot initiate DNA synthesis de novo; it needs a primer with a free 3'-OH group to add nucleotides, so a primer annealed to the template is necessary.
Provide the four deoxyribonucleotide triphosphates (dNTPs): dATP, dTTP, dGTP, and dCTP, which serve as the building blocks for the new DNA strand.
Include the DNA polymerase I enzyme itself, which catalyzes the polymerization reaction by adding nucleotides to the primer in the 5' to 3' direction.
Ensure the reaction mixture contains an appropriate buffer with Mg^{2+} ions, as these are essential cofactors for the enzymatic activity of DNA polymerase I.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Role of DNA Polymerase I
DNA Polymerase I is an enzyme that synthesizes DNA by adding nucleotides to a pre-existing strand. It requires a template strand to guide the sequence and can also remove RNA primers through its exonuclease activity, making it essential for DNA replication and repair.
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01:45
DNA Proofreading
Requirements for DNA Synthesis
In vitro DNA synthesis by DNA Polymerase I requires a single-stranded DNA template, a primer with a free 3'-OH group to initiate synthesis, all four deoxynucleotide triphosphates (dNTPs) as substrates, and appropriate buffer conditions including Mg2+ ions for enzyme activity.
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Primer-Template Structure
DNA Polymerase I cannot start DNA synthesis de novo; it needs a primer annealed to the template strand. The primer provides the free 3'-OH end necessary for the enzyme to add nucleotides, ensuring accurate and efficient DNA elongation.
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Related Practice
Textbook Question
Compare conservative, semiconservative, and dispersive modes of DNA replication.
Textbook Question
Which characteristics of DNA polymerase I raised doubts that its in vivo function is the synthesis of DNA leading to complete replication?
Textbook Question
In Kornberg's initial experiments, it was rumored that he grew E. coli in Anheuser-Busch beer vats. (Kornberg was working at Washington University in St. Louis.) Why do you think this might have been helpful to the experiment?
Textbook Question
Describe the role of ¹⁵N in the Meselson–Stahl experiment.
Textbook Question
Predict the results of the experiment by Taylor, Woods, and Hughes if replication were
(a) conservative and
(b) dispersive.
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