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Assume that a culture of E. coli was grown for approximately 50 generations in 15N (provided in the medium in the ammonium ion), which is a heavy isotope of nitrogen (14N). You extract the DNA from the culture, and it has a density of 1.723 gm/cm3 (water = 1.00 gm/cm3). From the literature, you determine that DNA containing only the common form of nitrogen, 14N, has a density of 1.700 gm/cm3. Bacteria from the 15N culture were washed in buffer and transferred to 14N medium for one generation immediately after which the DNA was extracted and its density determined.
What would be the expected density of the extracted DNA?
What band(s) would be expected if subjected to ultracentrifugation through a CsCl gradient?(b) How would your answer to (a) above differ if replication occurred in a conservative fashion?(c) Assume that the extracted DNA was completely denatured (separated into two single strands by heating at 90oC for 15 minutes), what would be the density (or densities) of the DNA (s) in the heated extract?
It is a very curcial concept to understand how the immune response is mounted against viruses, bacteria, protozoans and helminthes. For an effective immune response, both innate and adaptive immunity should work together.
This Project report elaborates a critical review of important elements attached to Advanced Glycated End Products (AGEs). It is very crucial to understand the process called Millard reaction.
Soil stabilization is the permanent physical and chemical alteration of soils to enhance their physical properties. Stabilization can increase the shear strength of a soil and control the shrink-swell properties.
This assignment has three parts which contains questions related to Microbiology. It contains basic principles of microscopy, staining techniques in microbiology and microbial growth in the food industry.
Lipid metabolites are often seen as key elements in cellular signaling. Is this unique? Please provide several examples of the function of lipids as key elements in signal arrays and list the biologic functions these signals affect?
Please describe how one might search for chemical structure, biologic function relationships, involving small molecular weight lipophylic compounds. Provide one example.
Write a case study which detailing a scenario of a patient being investigated in the Haematology laboratory.
The use of PCR and genetic approaches in biotechnology
Glucose oxidase is an enzyme that can be used for measurements of glucose levels by combining this reaction with an oxygen probe.
What phenotypic ratio would you get if you crossed a white mouse and a heterozygous brown mouse?
Prepare an essay on nosocomial infection.
To increase the awareness of monitoring and recording the blood pressure of patients and practice measuring blood pressure in a safe environment.
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