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A three-factor cross in Salmonella typhimurium was performed using bacteriophage P22. The cross was between an arg-leu-his- recipient bacterium and bacteriophage P22, which was grown on an arg+leu+his+ strain. 1000 arg+ transductants were selected and tested on several selective media by replica printing. The following results were obtained:
Arg+leu-his- 583Arg+ leu- his+ 300Arg+ leu+ his+ 114Arg+ leu+ his- 1
What is the order of the three markers?
What are the contransduction frequencies?
History of stem cell legislation and how does it compare to comparable statutes in the rest of the world? Talk about what the current legislative state of affairs is and where the law on stem cells in the United States should go in the future and why..
Your assistant Igor is studying a neurotransmitter-stimulated GPCR pathway, hypothesized to stimulate the expression of genes that increase retention of memory.
You had your flu shot but still got the flu. Use the knowledge of immunology to provide two explanations for this development.
Both endocrine and nervous systems are major regulating systems of the body; though, nervous system has been compared to an airmail delivery system and endocrine system to the pony express. In brief explain this comparison.
What is pneumothorax? Explain how it occurs using the intrapulmonary and pleural pressures.What happens when CO2 enters water solution? Write down the chemical equation. What happens to the concentration of H+? What happens to the pH.
A person has a tidal volume (TV) of 450 mL and his anatomical dead space (ADS) is 150 mL. His respiratory rate is 10 breaths per minute. What is his alveolar ventilation rate? please show calculation and correct units.
As the lab instructor for Cell Bio, you need to make a solution of DCMU, an inhibitor of photosynthetic electron transport. You want a final concentration of 2x10^-5 M in a final volume of 1.25 mls, and this needs to be achieved using a 10 microli..
How does inefficient transfer of energy among trophic levels result in the typically high endangerment status of many top predators.
Explain what is meant through a negative feedback loop and how these work in terms of regulating a metabolic pathway. provide an example of a negative feedback loop in the glycolytic pathway.
Top and bottom homologs both have 5 repeats. A cut is made in the middle of the top homolog (bottom homolog intact), after strand invasion and recombination the top homolog contains 7 repeats.
Calculate the total number of ATP molecules that will be produced upon complete breakdown of C14 fatty acid molecule. Show complete details of your calculation.
Briefly explain one aspect of ecology that you feel is relevant for all humans and discuss the difference between Clements and Gleason's views of how communities are structured?
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