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Q1. Between March 2 and April10, five chronic peritoneal dialysis patients at one hospital became infected with Pseudomonas aeruginosa. Four patients developed peritonitis (inflammation of the abdominal cavity), and one developed the skin infection at the catheter insertion site. All patients with peritonitis had low- grade fever, cloudy peritoneal fluid, and abdominal pain. All patients had permanent indwelling peritoneal catheters that the nurse wiped with gauze that had been soaked with an iodophor solution each time the catheter was connected to or disconnected from the machine tubing. Aliquots of iodophor were transferred from stock bottles to small in- use bottles. Cultures from dialysate concentrate and the internal areas of the dialysis machines were negative; iodophor from a small in- use plastic container yielded a pure culture of P. aeruginosa. What improper method led to this infection?
Q2. In comparing the genomes of humans and those of our higher primates, it is seen that humans have a large metacentric pair we call chromosome among our 46 chromosomes, while the other primates of this group have 48 chromosomes and any pair like the human pair is not present; in its place the primate groups each have two pairs of midsize acrocentric chromosomes. What is the most possible explanation?
ATP is a source of free energy that drives unfavorable reactions. a) Which of the following processes are coupled to the dephosphorylation of ATP?
Although several different mammalian species have been cloned, the efficiency of this process is extremely low. Often tens or even hundreds of oocytes must be implanted with donor nuclei to obtain one healthy live birth.
The movement of glucose into a cell against a concentration gradient is most likely to be accomplished by which of the subsequent. movement of glucose into the cell through a glucose channel.
In the killer whale hunting strategy, (a) propose two hypotheses for each (i) the origin of this hunting strategy and (ii) evolution of seal defense behavior. (b) Propose the tests of both of your hypotheses.
Assume that one hundred wolves of the same species reside on an isolated island develop a disease due to inbreeding. Scientists who ventured to the island have found.
For in case, it is well established that in presynaptic neurons, the elevation of cytosolic calcium triggers the fusion of exocytotic vesicles that contain neurotransmitters to the plasma membrane.
Why are mutation and recombination important in the process of natural selection and the evolution of organisms?
Josie has been taking steroids for a prolonged period of time as treatment for rheumatoid arthritis. She has gained weight, especially in her face, and notices that her skin is thin and bleeds easily.
Two pros and two cons of GM food. From those pros and cons, do you think GM foods are safe to eat? Why or why not.
How might a lack of cl transport cause the respiratory tract symptoms of cystic fibrosis (cf) specifically the thickened mucus.
The genes for vermillion (v) eyes, sable (s) body color, and forker (f) bristles are on the X-chromosome of Drosophile melanogaster. They map in the order of v, s, f, with 10 map units between v and s and 14 map units between s and f.
What factors might account for differences among taxa in their numbers of extant species? Suggest methods for determining which factor might actually account for an observed difference.
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