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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- 1What is the order of the three markers?What are the contransduction frequencies?
What changes in the CTD are necessary for recruitment of different proteins at different times during transcription.
The basic differences between RNA and DNA are.
If you were to mix the primer and template DNA shown below , along w/ a DNA polymerase and all 4 DNTP's . Recreate the template with the primer hybridized to it.
The PCR-derived DNA fragment used an insert in pUC19 was amplified by thenty-five cycles. Suppose that the PCR amplification process and restriction digestion process are 100% efficient.
Estimate the final guaiacol concentrationg of the following enzyme reaction solutions listed in the table below.
Toxic Chemicals in the tissues of organisms higher up in the food chain. are more concentrated than they are in the environment.
If we have a dsDNA molecule and we require an ssRNA molecule, which of the two DNA strands will have the same sequence as the RNA molecule?
What are the advantages of having a gene regulated by both positive and negative control, rather than by just one or the other?
Assume you are a population geneticist, studying a particular disease which is inherited as an autosomal recessive trait. In the population you are studying, the incidence of the disease is three percent.
Human populations originally descended from Africa. From there, several expansions into new habitats and environments resulted in cultural and genetic adaptation. One of these adaptations involved the low-oxygen habitats that occur at high altitude.
Describe why an anaerobic indicator strip in an anaerobic environment will revert to blue if it gets wet.
Explain interaction between export factors and viral components for nuclear exit also Explain the function of the host factors affected by the virus.
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