Question 5A culture of E. coli growing in a medium containing the normal,lighter isotope of nitrogen (¹4N) as the sole source of nitrogen istransferred to a medium containing the heavier isotope of nitrogen(15N) for 7 generations. What is the molar ratio (expressed as adecimal to the nearest thousandths) of the hybrid DNA (15N-14N)to heavy DNA (15N-15N) at this point? Hint: try to recognize thepattern represented by the above process to answer this questionmore efficiently.

Recall that: An important characteristic of DNA replication is that it is semiconservative. Two…

Answered: A culture of E. coli growing in a…

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

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Can you please help with 1c please picture with 1 graph is for question 1a) picture with 4 graphs is for question 1b) 1a) E. coli DNA and binturong DNA are both 50% G-C. If you randomly shear E. coli DNA into 1000 bp fragments and put it through density gradient equilibrium centrifugation, you will find that all the DNA bands at the same place in the gradient, and if you graph the distribution of DNA fragments in the gradient you will get a single peak (see below). If you perform the same experiment with binturong DNA, you will find that a small fraction of the DNA fragments band separately in the gradient (at a different density) and give rise to a small "satellite" peak on a graph of the distribution of DNA fragments in the gradient (see below). Why do these two DNA samples give different results, when they're both 50% G-C? 1b) If you denatured the random 1000 bp fragments of binturong DNA that you produced in question 1a by heating them to 95ºC, and then cooled them down to 60ºC…
Answer part C of the following: A) E. coli DNA and binturong DNA are both 50% G-C. If you randomly shear E. coli DNA into 1000 bp fragments and put it through density gradient equilibrium centrifugation, you will find that all the DNA bands at the same place in the gradient, and if you graph the distribution of DNA fragments in the gradient you will get a single peak (see below). If you perform the same experiment with binturong DNA, you will find that a small fraction of the DNA fragments band separately in the gradient (at a different density) and give rise to a small "satellite" peak on a graph of the distribution of DNA fragments in the gradient (see below). Why do these two DNA samples give different results, when they're both 50% G-C? See graph B. B) If you denatured the random 1000 bp fragments of binturong DNA that you produced in question 1a by heating them to 95ºC, and then cooled them down to 60ºC and allowed them to reanneal, you would find that approximately 15% of the…
The E. coli genome has a superhelical density in vivo of about 0.06. Assuming the DNA has 10.5 bp/turn, what is the expected writhing number of the E. coli genome?
T. aquaticusgenomic DNA is 34.3% guanosine nucleotides. What fraction of the DNA is adenosine nucleotides?
Dr. Wakefield would like to isolate recombinant plasmids from her bacterial culture using the alkaline lysis method. She is planning to use the chemicals as listed below: Solution I: 50 mM glucose, 25 mM Tris-Cl (pH 8.0), 10 mM EDTA (pH 8.0) Solution II: ??? Solution III: 5 M potassium acetate, glacial acetic acid, de-ion water Ethanol 70% (v/v) Isopropanol TE-RNAase pH 8.0 (i) (ii) (iii) Based on the chemical list above, state the content(s) of Solution II. Explain the functions of Solution II described in Q3 a) (i) in plasmid isolation. What is the role of alcohol precipitation conducted after the plasmids are obtained at the end of the procedure? Discuss the roles of ethanol and salt in alcohol precipitation step.
For the following situations, indicate whether homologous or non-homologous DNA strands are preferred to use as template: Prokaryotic double strand break repair: Mitotic double strand break repair: Meiotic double strand break repair:
From an Escherichia coli strain, five Hfr strains were isolated. The location and orientation of the transfer origin of each Hfr strain is shown in Figure 1. You want to use these five strains to map the locus responsible for thiamine synthesis, called thi. Each Hfr strain is sensitive to rifampicin (Rifs) and thi*. Conjugation experiments are performed between each of the Hfr strains and an F strain Rif Thi™. 0 T leu 10 20 T nadD pyrC trp 40 T his 60 70 2) The results are shown in the following table: Donor strain Hfr1 Hfr2 Hfr3 Hfr4 Hfr5 cysG 80 90 1) What is the selection medium used in these conjugation experiments metA Colonies Thi+ 1000 0 400 0 25 100 Hfr1 Hfr2 Figure 1: Chromosome map of Escherichia coli. Five Hfr strains (Hfr1 to Hfr5) were isolated and the location and orientation of the origin of transfer is shown by the arrows in each Hfr strain. Distances in minutes are shown. Leu: leucine biosynthesis; nadD: NAD biosynthesis; pyrC: pyrimidine biosynthesis; trp: tryptophan…
You have a 20 mg/ml of Ethidium bromide stock solution. You need to a final concentration of 2ug/ml into a Agarose solution to visualize DNA. What is the dilution factor? Give typing answer with explanation and conclusion

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