Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 11.3, Problem 1CC
If this experiment was conducted for four rounds of
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Why were Meselson and Stahl unable to distinguish between the dispersive and the semiconservative models following only one round of DNA replication?
If DNA replication were dispersive instead of semi-conservative how many "bands" would Meselson and Stahl have expected to see in their experiment after 4 rounds of replication in "light" nucleotides?
What observation in the Meslson and Stahl experiment to decipher the DNA replication model distinguishes the semi-conservative from the dispersive mode of replication? Explain.
Chapter 11 Solutions
Biology
Ch. 11.1 - Prob. 1CSCh. 11.1 - Prob. 1EQCh. 11.1 - Prob. 2EQCh. 11.1 - CoreSKILL In the experiment of Avery, MacLeod,...Ch. 11.2 - Prob. 1CCCh. 11.2 - Prob. 2CCCh. 11.2 - Core Skill: Modeling The goal of this modeling...Ch. 11.2 - Prob. 2CSCh. 11.3 - If this experiment was conducted for four rounds...Ch. 11.4 - Molecular Mechanism of DNA Replication Concept...
Ch. 11.4 - Prob. 2CCCh. 11.4 - Prob. 3CCCh. 11.4 - Prob. 4CCCh. 11.5 - Prob. 1CCCh. 11.5 - Prob. 1CSCh. 11 - Why did researchers initially believe that the...Ch. 11 - Prob. 2TYCh. 11 - Which of the following equations is accurate...Ch. 11 - Prob. 4TYCh. 11 - Which of the following statements about the...Ch. 11 - Meselson and Stahl were able to demonstrate...Ch. 11 - During replication of a DNA molecule, the daughter...Ch. 11 - Prob. 8TYCh. 11 - A nucleosome is a. a dark-staining body composed...Ch. 11 - The conversion of euchromatin into heterochromatin...Ch. 11 - What are the four key criteria that the genetic...Ch. 11 - A double-stranded DNA molecule contains 560...Ch. 11 - Prob. 3CQCh. 11 - Prob. 1COQCh. 11 - CoreSKILL How might you provide evidence that DNA...
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- The chromosome of E. coli contains 4.6 million bp. How long will it take to replicate its DNA? Assuming that DNA polymerase III is the primary enzyme involved and that it can actively proofread during DNA synthesis, how many base pair mistakes will be made in one round of DNA replication in a bacterial population containing 1000 bacteria?arrow_forwardIn the Meselson–Stahl experiment thatestablished the semiconservative nature of DNA replication,the extraction method produced short fragments of DNA. Whatsort of results might have been obtained with longer piecesof DNA?arrow_forwardIn the Meselson-Stahl experiment on DNA replication, what fraction of the DNA was composed of one light strand and one heavy strand ("hybrid") after one generation of growth in medium containing 14N? After two generations of growth in a medium containing 14N? What fraction of hybrid DNA is expected after n generations of growth in a medium containing 14N?arrow_forward
- The Meselson-Stahl experiment provided strong evidence that DNA replication was conservative, by alternately growing bacteria in medium with heavy 15N and light 14N. If DNA replication were dispersive, what result would Meselson and Stahl have observed after the first round of DNA replication in light nitrogen? Group of answer choices Two bands, one at the location for pure 15N and one at the location for pure 14N. One band, located half way between the locations for pure 15N and pure 14N. Two bands, one at the location for pure 15N and one located halfway between the locations for pure 15N and pure 14N. None of these Three bands, one at the location for pure 15N, one at the location for pure 14N, and one at a location halfway between.arrow_forwardIf DNA replication followed the dispersive model of replication, how would the outcomes of the Meselson-Stahl experiment change? Describe the composition of DNA samples after one and two rounds of replication, and how this is different from the findings of the original experiment.arrow_forwardIn terms of new DNA strands that are generated, what are the differences between replication and conventional polymerase chain reactions?arrow_forward
- Assuming DNA replicates semi-conservatively, which of these most closely approximates what you would see after one generation if you were to perform the Meselson-Stahl experiment? one band two bands three bandsarrow_forwardSuppose that 28% of the nucleotides in a DNA moleculeare deoxythymidine 5′- monophosphate, and that duringDNA replication the percentage amounts of availablenucleotide bases are 22% A, 22% C, 28% G, and 28% T.Which base would be depleted first in the replicationprocess?arrow_forwardApproximately how many high-energy bonds does DNA polymerase use to replicate a bacterial chromosome (ignoring helicase and other enzymes associated with the replication fork)? compared with its own dry weight of 10–12 g, how much glucose does a single bacterium need to provide enough energy to copy its DNA once?arrow_forward
- What would Meselson and Stahl have seen after 1,2, and 3 generations of replication if the dispersive model of DNA replication were correct?arrow_forwardIn gel electrophoresis, are the DNA fragments attracted to, or repelled from the negative pole of the electric field? The positive pole? Why are these attractions and repulsions important to the process?arrow_forwardIs it biologically possible for DNA to undergo replication in vivo, without the lagging and the leading strands? In PCR, we also start with an antiparallel strand of DNA. Does this also mean that replication is semi-discontinuous in in vitro replication?arrow_forward
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