Microbiology: An Evolving Science (Fourth Edition)
4th Edition
ISBN: 9780393615098
Author: John W. Foster, Joan L. Slonczewski
Publisher: W. W. Norton & Company
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Chapter 7.3, Problem 1TQ
Summary Introduction
To review:
The semiconservative nature of deoxyribonucleic acid (
Introduction:
The replication of cellular DNA is semiconservative in which each daughter cell receives one parental and one newly synthesized strand. It involves the formation of a replication bubble with two replication forks in the bacterial cells. The replication is bidirectional as it begins at a fixed position and proceeds in the opposite direction.
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A DNA fragment with 450 bp will be closer to the top (negative pole) of an electrophoresis gel than one with 2,500 bp.True or false?
You have isolated genomic DNA and plasmid DNA from a bacterial culture. Please answer the following questions:
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Chapter 7 Solutions
Microbiology: An Evolving Science (Fourth Edition)
Ch. 7.2 - Prob. 1TQCh. 7.2 - Prob. 2TQCh. 7.2 - Prob. 3TQCh. 7.2 - Prob. 4TQCh. 7.3 - Prob. 1TQCh. 7.3 - Prob. 2TQCh. 7.3 - Prob. 3TQCh. 7.3 - Prob. 4TQCh. 7.3 - Prob. 5TQCh. 7.6 - Prob. 1TQ
Ch. 7.6 - Prob. 2TQCh. 7.6 - Prob. 3TQCh. 7 - Prob. 1RQCh. 7 - Prob. 2RQCh. 7 - Prob. 3RQCh. 7 - Prob. 4RQCh. 7 - Prob. 5RQCh. 7 - Prob. 6RQCh. 7 - Prob. 7RQCh. 7 - Prob. 8RQCh. 7 - Prob. 9RQCh. 7 - Prob. 10RQCh. 7 - Prob. 11RQCh. 7 - Prob. 12RQCh. 7 - Prob. 13RQCh. 7 - Prob. 14RQCh. 7 - Prob. 15RQCh. 7 - Prob. 1TQCh. 7 - Prob. 2TQCh. 7 - Prob. 3TQ
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- In DNA isolation techniques, a washing step is always done prior to the final resuspension. What is the purpose of this step? In DNA isolation from blood samples, why does the vial for blood storage contain EDTA? In the preparation for DNA isolation in plants, the plant source is refrigerated and ground prior to extraction. Why is this so? Why are DNA pellets air-dried before resuspension in buffer?arrow_forwardWhat is the concentration of a DNA solution that absorbs 0.812 and 0.463 at 260 and 280 nm, respectively? Is the DNA solution considered to be good quality? Why or why not?arrow_forwardWith regard to Chargaff’s experiment described in Figure shown,answer the following:A. What is the purpose of paper chromatography?B. Explain why it is necessary to remove the bases in order todetermine the base composition of DNA.C. Would Chargaff’s experiments have been convincing if theyhad been done on DNA from only one species? Discuss.arrow_forward
- To carry out sequencing, you need to include 600 ng of DNA and a total of 6.4 pmol of sequencing primer. If your concentration of DNA (determined by A260 reading on a Nanodrop Spectrophotometer) is 89.0 ng/μL, how many μL of this sample do you need for a total of 600 ng?arrow_forwardDuring agarose gel electrophoresis, why does DNA move through the gel when electric current is applied? because DNA is negatively charged because a charged chemical from the loading buffer is bound to the DNA because DNA is positively charged because DNA absorbs electricityarrow_forwardRefer to Figure, which presents the Meselson–Stahl experiment. DNA molecules can be denatured by high pH, as well as by heat. Suppose that the CsCl gradient centrifugations were run at pH 12, conditions under which DNA strands separate. Sketch the gradient profiles expected for each of the four samples depicted in the figure.arrow_forward
- What is the role of GelRed® in Agarose gel electrophoresis of DNA fragments? GelRed® moves down the agarose gel in response to the electric current and enables visualisation of the position of the nucleic acids within in the agarose gel. GelRed® intercalates with the Nucleic acid and, under UV light, fluoresces to enable visualisation of the position of the nucleic acids in the agarose gel. GelRed® intercalates with the Nucleic acid and enables visualisation of the position of the nucleic acids in the agarose gel. GelRed® intercalates with the amino acids in the agarose gel and enables visualisation of the position of their in the agarose gel.arrow_forwardWhen proteins are separated using native gel electrophoresis, size, shape, and charge control their rate of migration on the gel. Why does DNA separate based on size, and why do we not worry much about shape or charge?arrow_forwardThe given figure shows the denaturation curves for three DNA samples. A) What is the ?m of the most GC-rich DNA sample? B) Which point represents double-stranded DNA?arrow_forward
- If it is not possible to have three bands for one STR region when looking at the DNA from one individual, then how many different STR regions were sampled in the gel electrophoresis simulation to end up with three bands on the gel? Note: there are several correct answers.arrow_forwardA. A plasmid is shown with the locations of various restriction enzyme sites labeled. If you cut the plasmid with Xhol and Xbal, which lane of the agarose gel represents the DNA fragments you would expect from the digestion? B. If you now decide to cut the plasmid with EcoRI, how many fragments will be produced and what will their sizes be? C. When running DNA samples on agarose gel, an electric field is applied. Towards which electrode will the DNA migrate and why?arrow_forwardCalculate the concentration of DNA in your purified sample and determine the mass of the purified DNA. At 260nm the value was 1.0241........... at 280m, the value was 0.5829 Could you please explain and show the calculation of how to get the answer?arrow_forward
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