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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 are genotypes of all the individuals mentioned in this difficulty. What is the point of the agar dish not treated with X-gal.
The endosymbiosis theory discusses that mitochondria and chloroplasts were originally prokaryotic cells that were engulfed by ancestors of current day eukaryotic cells.
Water at room temperature is placed in flask connected through rubber tubing to a vacuum pump and the pump is turned on.
Consider a culture into which two E. coli strains are inoculated. Strain A is normal with g=21 min at 37 degrees C, and 42 mins at 27 degrees C. Strain B has a temperature-sensitive mutation, such that g=55 mins at 37 degrees C, and 39 mins at 27 ..
A bacteriophage contains a single stranded DNA molecule. This DNA contains 19% adenine, 23% thymine, 45% guanine, and 13 percent cytosine. An RNA molecule complementary to this DNA is made.
This is a kitchen activity and needs the use of a blender or you can boilthe cabbage instead, red cabbage and assorted foods and liquids.
Determine the genotype and phenotype on the F1 and F2 generations when you cross a wildtype female with a double mutant male.
The "Primordial soup" includes the mixture of elements and gases which are thought to have started life on the Earth. Specify where did the gases and elements come from?
The intestinal stem cell sits exactly at position four in the crypt. What experiment was performed to find out it is the stem cell? At that position,
What carries genes for antibiotic resistance in prokaryotes?
Photosynthetic, multicellular eukaryote that is anchored to the rocks surrounding the coastline of crystal lake , but has no roots. Low growing and non-motile, this organism relies on the tidal rise and fall of crystal lake for water and nutrient ..
Describe the procedure called southern blotting in which probes are used to find which DNA band from a gel contains a particular gene of interest.
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