The 3' exonuclease activity of E. coli DNA polymerase I was foundto show no discrimination between correctly and incorrectly base-paired nucleotides at the 3' terminus; properly and improperlybase-paired nucleotides are cleaved at equal rates there. How canthis observation be reconciled with the fact that the 3' exonucleaseactivity increases the accuracy with which template DNA is copied?

DNA polymerase enzyme is involved in the synthesis of DNA. The nucleotides gets added one by one to…

Answered: The 3' exonuclease activity of E. coli…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

After digesting the DNA produced by PCR (generated using the primers mentioned in question 2 added for context below) and the pET-28a vector with restriction enzymes SacI and HindIII, what steps would be needed to obtain a pure culture of E. coli cells that contain the pET-28a-OXA-M290 plasmid (i.e., a culture which consists only of E. coli cells that contain this plasmid)? And, how could you confirm that the OXA-M290 gene was successfully cloned into the pET-28a vector without any mutations? [4 – 8 sentences suggested] Question 2 (Do not answer, just for context):The forward primer that will be designed is the primer that binds to the region of the OXA-M290 gene where the start codon is located, and the reverse primer is the primer that binds to the region of the gene where the stop codon is located. In order to clone the PCR product generated using these primers into pET-28a, extra nucleotides must be added to the 5' ends of the primers. These extra nucleotides will contain the…
A 2.0kb bacterial plasmid ‘BS1030’ is digested with the restriction endonuclease Sau3A; the plasmid map is depicted in the diagram below and the Sau3A (S) restriction sites are indicated. Which of the following DNA fragments do you expect to see on an agarose gel when you run Sau3A-digested plasmid ‘BS1030’ DNA? a. 250 bp, 450 bp, 550 bp, 1.1 kb, 1.5 kb and 2.0 kb b. 2.0kb c. 250 bp, 400 bp, 450 bp, 500 bp and 550 bp d. 100 bp, 200 bp, 250 bp, 400 bp, 500 bp and 550 bp
An optimum ligation reaction should contain approximately 50 ng of vector. Given yourconcentrations recorded below, what is the volume of vector that should be added to eachligation reaction to have this mass of DNA in the reaction? Size of asPink-promoterless in bp: 702 (vector) Size of pCusC in bp: 157 The concentration of digested & purified PCR insert: 13.849 The concentration of digested and purified plasmid: 6.887 Any help with this is appreciated. I'm a bit confused thx
A PCR reaction was performed to amplify the XULA4 gene, which is bp 524-6,480 on a plasmid that is 9,435 bp. After the PCR, the product was digested with XhoI. There are XhoI sites on the plasmid at bp 151, 1,336, and 4,795. Calculate the size(s) that would result when the product is digested with XhoI. Then enter the size of the largest fragment (in bp).
In reversible terminator sequencing, how would the sequencing process be affected if the 3′-end-blocking group of each nucleotide were replaced with the 3′-H present in the dideoxynucleotides used in Sanger sequencing?
In another experiment using Quikchange to amplify the pQE.1-CRYGD plasmid containing our mutation, you added all needed components properly including primers and template DNA, but your Quikchange still doesn't work. One change was made to the protocol in step 1, you performed your reaction at 50 degrees C instead of 95 degrees C. Why didn't the reaction work? In the next attempt, you add dNTPs, polymerase, buffer, and your primers, but forgot to add your template DNA. Why did you know that the reaction could not work without template DNA?
If deoxyribonucleotides that lack the 3’-OH groups are added during the replication process, what do you expect will occur? Describe what happens when a nonsense mutation is introduced into the gene encoding transposase within a transposon. A pure culture of an unknown bacterium was streaked onto plates of a variety of media. You notice that the colony morphology is strikingly different on plates of minimal media with glucose compared to that seen on trypticase soy agar plates. How can you explain these differences in colony morphology?
What type of repair would be used to fix a mutation that arises during replication and that escapes detection by polymerase proofreading mechanisms? What is the most likely reason that this mutation escaped correction during proofreading?
Clone number in this case is number 196 which is shown in the images. State whether a BamHI site has been re-created at the forward- and the reverse-end junctions of the human DNA with the plasmid vector band sizes are shown in one of the images. (0.5, 1, 2, 3, 4, 5, 6, 8, 10kb)
In large-genome sequencing projects, the initial data usually reveal gaps where no sequence information has been obtained. To close the gaps, DNAprimers complementary to the 5′-ending strand (that is, identical to the sequence of the 3′-ending strand) at the end of each contig are especially useful. Explain how these primers might be used.
Many of the gene products involved in DNA synthesis wereinitially defined by studying mutant E. coli strains that could notsynthesize DNA. Question: The dnaE gene encodes the a subunit of DNA polymeraseIII. What effect is expected from a mutation in this gene?How could the mutant strain be maintained?
Ligation is an essential step in the cloning process. It refers to the joining of the gene of interest to the vector using DNA ligase. (i) Determine FOUR (4) control groups which are important to determine the success of this step and also to troubleshoot if any problem should occur. In an experiment, 100 ng vector was added into ligation reaction with 50 ng of insert (500 bp). The desired vector: insert ratio of 1: 3 was used. Determine the size of the (ii) vector.

SEE MORE QUESTIONS

Recommended textbooks for you

Biochemistry

ISBN:

9781319114671

Author:

Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:

W. H. Freeman

Lehninger Principles of Biochemistry

Biochemistry

ISBN:

9781464126116

Author:

David L. Nelson, Michael M. Cox

Publisher:

W. H. Freeman

Fundamentals of Biochemistry: Life at the Molecul…

Biochemistry

ISBN:

9781118918401

Author:

Donald Voet, Judith G. Voet, Charlotte W. Pratt

Publisher:

WILEY

Biochemistry

ISBN:

9781319114671

Author:

Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:

W. H. Freeman

Lehninger Principles of Biochemistry

Biochemistry

ISBN:

9781464126116

Author:

David L. Nelson, Michael M. Cox

Publisher:

W. H. Freeman

Fundamentals of Biochemistry: Life at the Molecul…

Biochemistry

ISBN:

9781118918401

Author:

Donald Voet, Judith G. Voet, Charlotte W. Pratt

Publisher:

WILEY

Biochemistry

ISBN:

9781305961135

Author:

Mary K. Campbell, Shawn O. Farrell, Owen M. McDougal

Publisher:

Cengage Learning

Biochemistry

ISBN:

9781305577206

Author:

Reginald H. Garrett, Charles M. Grisham

Publisher:

Cengage Learning

Fundamentals of General, Organic, and Biological …

Biochemistry

ISBN:

9780134015187

Author:

John E. McMurry, David S. Ballantine, Carl A. Hoeger, Virginia E. Peterson

Publisher:

PEARSON

SEE MORE TEXTBOOKS