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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?
What are some major structural differences between tight junctions, adherens junctions, and desmosomes.
Diffusion is defined as the movement of solute molecules from a region of high concentration to low concentration. To learn about some of the factors that affect the rate of diffusion,How would increasing temperature affect diffusion rate
Red-green color blindness is a sex-linked recessive trait. Consider a woman, Jane, with red-green color blindness who has a mother with normal vision. Jane marries a man with normal vision.
Why is it important to take a baseline measurement of oxygen generation rate in the dark before taking readings of the organisms at different light levels?
Describe the substrates/products that link the light reactions of photosynthesis to the Calvin cycle.
A man drops a baseball off of the top of the Empire State Building. If the action force is the pull of the Earth on the ball, then what is the reaction force. What is the most possible diagnosis of the condition described? Explain.
If a cell with 2n=4 chromosomes failed to separate homologous chromosome pairs correctly during meiois, so that one pair went to one daughter cell and other cell received no copy,
What are some Possible reasons why higher concentrations of colistin and nalidixic acid was less effective at allowing growth of gram-positive organisms?
Which of the follow is NOT a function of meiosis. Generation of genetic diversity by crossing over.
Which of the following amino acids could result from a single-base substitution in GGA (gly)?
An arginine residue in the matrix side proton channel of a subunit of ATP synthase is near the aspartate residue in the c ring subunit.
Explain how the use of Mst ll and the southern blot could confirm a diagnosis of sickle cell disease (a homozygote for Hb S), sickle cell trait (a heterozygote carrier for HbS) or normal Hb A.
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