Textbook Question
Kornberg showed that nucleotides are added to the 3' end of each growing DNA strand. In what way does an exposed 3'-OH group participate in strand elongation?
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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 8
How did Kornberg assess the fidelity of DNA polymerase I in copying a DNA template?
Verified step by step guidance1
Understand that fidelity in DNA polymerase refers to the enzyme's accuracy in incorporating the correct nucleotides complementary to the DNA template strand during DNA synthesis.
Recognize that Kornberg assessed fidelity by measuring the frequency of errors (mutations) introduced by DNA polymerase I when copying a known DNA template sequence.
Kornberg used an experimental setup where DNA polymerase I was allowed to synthesize a new DNA strand using a single-stranded DNA template and a supply of nucleotides, including radioactive or labeled nucleotides to track incorporation.
He then analyzed the newly synthesized DNA product to detect mismatches or errors, often by using genetic assays that could reveal mutations or by biochemical methods that detect incorrect base pairing.
By comparing the number of correct incorporations to the number of errors, Kornberg calculated the fidelity of DNA polymerase I, often expressed as the error rate or accuracy per nucleotide incorporated.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
DNA Polymerase I Function
DNA Polymerase I is an enzyme responsible for synthesizing DNA by adding nucleotides complementary to a DNA template strand. It also has proofreading activity, which helps correct errors during DNA replication, ensuring accurate DNA copying.
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Fidelity of DNA Replication
Fidelity refers to the accuracy with which DNA polymerases replicate DNA. High fidelity means fewer errors or mutations during DNA synthesis, which is critical for maintaining genetic stability across generations.
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Experimental Assessment of Enzyme Fidelity
Kornberg assessed DNA polymerase I fidelity by measuring the frequency of errors made during DNA synthesis, often using assays that detect mismatches or mutations in the newly synthesized DNA. This involved comparing the sequence of the product to the template to quantify accuracy.
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Related Practice
Textbook Question
What are the requirements for in vitro synthesis of DNA under the direction of DNA polymerase I?
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
Predict the results of the experiment by Taylor, Woods, and Hughes if replication were
(a) conservative and
(b) dispersive.
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Textbook Question
What was the significance of the polA1 mutation?
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