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- Semiconservative or Conservative DNA Replication If 15N-Iabeled E. coli DNA has a density of 1.724 g/mL, 14N-labeled DNA has a density of 1.710 g/mL, and E. coli cells grown for many generations on 14NH4+as a nitrogen source are transferred to media containing 15NH4+as the sole N-source, (a) What will be the density of the DNA after one generation, assuming replication is semiconservative? (b) Suppose replication took place by a conservative mechanism in which the parental strands remained together and the two progeny strands were paired. Design an experiment that could distinguish between semiconservative and conservative modes of replication.Homologous Recombination, Heteroduplex DNA, and Mismatch Repair Homologous recombination in E. coli leads to the formation of regions of heteroduplex DNA. By definition, such regions contain mismatched bases. Why doesn’t the mismatch repair system of E. coli eliminate these mismatches?A single strand of DNA, 24 nucleotides long, with the sequence 5'-TTTCCCgggAAAgggTTTAAAggg-3' is in a test tube. (Note that G's are shown in lowercase, so that your eye can better distinguish them from C's) Other than the appropriate buffer solution, what else needs to go in the test tube to so that we end up with a piece of double stranded DNA, 24 base pairs long, with the above sequence comprising one of the two strands?
- Can somone check my answers are in bold please for both questions :Which is NOT true of the different conformations of DNA? A. Z-DNA is a left-handed spiral. B. Both A-DNA and B-DNA are dehydrated. C. A-DNA and B-DNA are right-handed spirals. D. A-DNA and Z-DNA segments are limited to short regions of DNA. For double-stranded DNA, consider the following base ratios: A/G C/T C/G (A+C)/(G+T) (A+G)/(C+T) (A+T)/(G+C) Which of those ratios always equals 1? A. 3, 4, and 5 B. 3 and 6 C. 1, 4, and 5 D. 4 and 6 E. 1 and 2Can you please help with 1a 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 and…Agarose gels with different average pore sizes areneeded to separate DNA molecules of different sizeclasses. For example, optimal separation of 1100 bpand 1200 bp fragments would require a gel with alarger average pore size than optimal separation of8500 bp and 8600 bp fragments. How do you thinkthat scientists prepare gels of different average poresizes? (Hint: Agarose gels are made in a mannersimilar to gelatin desserts such as JELL-O.)
- BamHI cut sequence: G//GATCC and each sequence is 250 nucleotides long. How many DNA segments would be created by cutting the normal gene with BamHI?T. aquaticusgenomic DNA is 34.3% guanosine nucleotides. What fraction of the DNA is adenosine nucleotides?Interpret the fluorescent peaks obtained during a DNAsequencing run as a sequence of nucleotides with theproper polarity
- The total (50ul) of your restriction digest contains 500ng of DNA how much DNA (ng) are you loading into the gel?P2. Calculate the frictional coefficient of a molecule of DNA of 20 base pairs in water at 20C; assume that the hydrodynamic behavior of the DNA itself can be approximated to be rod-like; the viscosity of the solvent is 0.01 g cm-1 s -1When a double-stranded DNA molecule is exposed tohigh temperature, the two strands separate, and themolecule loses its helical form. We say the DNA hasbeen denatured. (Denaturation also occurs whenDNA is exposed to acid or alkaline solutions.)a. Regions of the DNA that contain many A–T basepairs are the first to become denatured as the temperature of a DNA solution is raised. Thinkingabout the chemical structure of the DNA molecule, why do you think the A–T-rich regionsdenature first?b. If the temperature is lowered, the original DNAstrands can reanneal, or renature. In addition to thefull double-stranded molecules, some molecules ofthe type shown here are seen when the moleculesare examined under the electron microscope. Howcan you explain these structures?