Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Chapter 14, Problem 27CTQ
How did the scientific community learn that
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Why is the replication of DNA referred to as a semiconservative process? What is the experimental evidence for the semiconservative nature of the process? What experimental results would you expect if replication of DNA were a conservative process?
In DNA replication, the enzyme helicase breaks hydrogen bonds between complementary nucleotides
and causes the double-stranded DNA to become single-stranded (denatures the DNA). What is used in PCR
to break the hydrogen bonds between complementary nucleotides?
A) buffers
B) DNases
C) taq Polymerase
D) heat
E) helicase
The enzyme that proofreads the new strand of DNA, looking for and correcting mistakes as it replicates is called:
A) helicase
B) DNA polymerase III
C) ligase
D) RNA polymerase
E) primase
Chapter 14 Solutions
Biology 2e
Ch. 14 - Figure 14.10 In eukaryotic cells, DNA and RNA...Ch. 14 - Figure 14.14 You isolate a cell strain in which...Ch. 14 - Figure 14.21 A fr am eshift mutation that results...Ch. 14 - If DNA of a particular species was analyzed and it...Ch. 14 - The experiments by Hershey and Chase helped...Ch. 14 - Bacterial transformation is a major concern in...Ch. 14 - DNA double helix does not have which of the...Ch. 14 - In eukaryotes, what is the DNA wrapped around?...Ch. 14 - Meselson and Stahl's experiments proved that DNA...Ch. 14 - If the sequence of the 5'-3' strand is AATGCTAC,...
Ch. 14 - How did Meselson and Stahl support Watson and...Ch. 14 - Which of the following components is not involved...Ch. 14 - Which of the following does the enzyme primase...Ch. 14 - In which direction does DNA replication take...Ch. 14 - A scientist randomly mutates the DNA of a...Ch. 14 - The ends of the linear chromosomes are maintained...Ch. 14 - Which of the following is not a true statement...Ch. 14 - During proofreading, which of the following...Ch. 14 - The initial mechanism for repairing nucleotide...Ch. 14 - A scientist creates fruit fly larvae with a...Ch. 14 - Explain Griffith's transformation experiments What...Ch. 14 - Why were radioactive sulfur and phosphorous used...Ch. 14 - When Chargaffwas performing his experiments, the...Ch. 14 - Provide a brief summary of the Sanger sequencing...Ch. 14 - Describe the structure and complementary base...Ch. 14 - Prokaryotes have a single circular chromosome...Ch. 14 - How did the scientific community learn that DNA...Ch. 14 - Imagine the Meselson and Stahl experiments had...Ch. 14 - DNA replication is bidirectional and...Ch. 14 - What are Okazaki fragments and how they are...Ch. 14 - If the rate of replication in a particular...Ch. 14 - Explain the events taking place at the replication...Ch. 14 - What is the role of a primer in DNA replication?...Ch. 14 - Quinolone antibiotics treat bacterial infections...Ch. 14 - How do the linear chromosomes in eukaryotes ensure...Ch. 14 - What is the consequence of mutation of a mismatch...Ch. 14 - An adult with a history of tanning has his genome...
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- Why is DNA replication called semiconservative?arrow_forwardDNA replication is semi-conservative, this statement means that Question 6 options: a) the new DNA molecules that are made are not identical to the original DNA molecule. b) the new DNA molecules that are made are only partially DNA since RNA primers are included. c) the new DNA molecules that are made are composed of one strand of the old DNA molecule and one strand of new DNA. d) of the two new DNA molecules made, one is entirely new DNA and one is entirely old new. e) the new DNA molecules that are made have a mixture of old and new DNA in each strand of the DNA duplex, randomly interspersed.arrow_forwardWhat is meant by the semiconservative nature of DNA replication?arrow_forward
- 10) Which of the following statements is false? A) Single stranded binding proteins help nucleotide bases pair during DNA replication. B) Topoisomerase prevents DNA from getting overwound during replication. C) DNA ligase connects Okazaki fragments during DNA replication. D) DNA helicase separates complementary strands of DNA during replication.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_forwardWhich of the following enzymes is the principal replication enzyme in E. coli?a) DNA polymerase Ib) DNA polymerase IIc) DNA polymerase IIId) None of thesearrow_forward
- You have isolated what appears to be alien DNA. While studying its replication, you performed the exact experiment Meselson and Stahl did. After three generations, the DNA is subjected to a CsCl gradient, and only one band appears. What type of replication does this DNA undergo?Question 3 options: A) semiconservative B) conservative C) dispersivearrow_forwardBacterial DNA has how many origins of replication? A) 0 B) 1 C) 10 D) depends on the size of the DNAarrow_forwardWhy is DNA replication described as “semiconservative?”arrow_forward
- Which of the following enzymes remove supercoiling in replicating DNA ahead of the replication fork?a) DNA polymerasesb) Helicasesc) Primasesd) Topoisomerasesarrow_forwardWhich helps prevent errors in DNA replication? A) Complementary base pairing reduce errors B) DNA ligase checks the DNA for errors C) DNA is located in the ribosomes D) Any base can pair with any other basearrow_forwardIn DNA replication, the role of topoisomerase is to Question 11 options: a) "unzip" the double stranded DNA in front of DNA polymerase. b) maintain the single stranded DNA. c) supercoil the DNA after the replication fork has passed. d) relieve supercoil tension in the DNA in front of the replication fork.arrow_forward
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