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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?
Explain in detail how sensory and motor neurons will operate if someone steps on your toe.
Compared to prokaryotes, the eukaryotic genome is more complex and contains large amounts of noncoding sequences. Describe the process by which eukaryotic promoters are recognized. How does the transcriptional machinery find the appropriate promot..
The idea is that this arrangement will allow animals and plants to migrate between refuges. Why would such migration be significant. Examine the F1 offspring from this cross.
Injections of TC cells completely removed all Hepatitis B viruses from infected mice, but the injections killed only 5 percent of the infected liver cells.
Cytosolic Ca2+ concentrations typically rise about 50-fold when Ca2+ channels open in the plasma membrane. Assume that 1000 Ca2+ channels open in a cell with a volume of 1000 µm3 and an internal Ca2+ concentration of 100 nM.
Think of the beaver's digestive organ system. Clarify its overall role. List several of the organs in this system, describe how each functions, and outline how organs work together to carry out the role of the organ system.
In England in the 1700s, Edward Jenner injected a child with a smallpox vaccine that had not yet been tested. After some time had passed, he injected the same child with a living smallpox virus. How do you think Jenner's experimental method differ..
Yet jam can be left unrefrigerated for long periods without contamination by bacteria and mold. Which provides the best explanation for this phenomenon.
What causes are responsible for the dispersal of fish across coral reefs.
Rate of flow of oxygen across the mitochondrial membrane is 43 nmoles/min when the intra-mitochondrial concentration is 120micrometers, O2 and the cytosolic concentration of o2 is 100 micrometers.
Some restriction enzymes produce fragments that have single stranded ‘sticky ends', while other enzymes do not leave single stranded ends.
What impact will the loss of land plants have on the soil? increased nutrient levels decreased soil stability decreased surface temperature ncreased biodiversity of soil-dwelling invertebrates.
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