A mixture of four -[32P]-labeled ribonucleoside triphosphates was added to permeabilized bacterial cells undergoing DNA replication in

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A mixture of four α-[32P]-labeled ribonucleoside triphosphates was added to permeabilized bacterial cells undergoing DNA replication in the presence of an RNA polymerase inhibitor, and incorporation into high-molecular-weight material was followed over time, as shown in the accompanying graph. After 10 minutes of incubation, a 1000-fold excess of unlabeled ribonucleoside triphosphates was added, with the results shown in the graph.
(a) Why was the excess of unlabeled rNTPs added?
(b) How could you tell that radioactivity is being incorporated as ribonucleotides rather than as an alternative such as reduction to deoxyribonucleotides, followed by incorporation?
(c) What does this experiment tell you about the process of DNA replication?
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Biochemistry Concepts and Connections

ISBN: 978-0321839923

1st edition

Authors: Dean R. Appling, Spencer J. Anthony Cahill, Christopher K. Mathews

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