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Q. Most biologists believe that immunes system's defense against infections largely rests on its ability to distinguish self molecules from non-self molecules. This concept seems central to our understanding of immune function. Numerous immunologists have developed an alternative hypothesis: that the immune system's effectiveness rests mostly on its ability to recognize damage to body tissues caused by the invaders, not on the ability to recognize non-self. If you were going to rest the "damage" hypothesis, what may you look for? Which sort of cell would you expect to be directly affected by damaged tissues? Why? Some proponents argue that the "damage" hypothesis makes more sense from an evolutionary perspective, claiming that it is more advantageous for an organism's defense system to respond to tissue damage than to the mere presence of a foreign microbe. Do you agree? Why or why not?
what is the effect of longer UV exposure on Serratia Marcescens?to answer thsi question which plates should be compared?
Insulin is released from pancreatic b cells when blood glucose levels increase and glucagon is released from pancreatic a cells when blood glucose levels decrease.
Describethe results, in the context of the rate of electron flow through the thylakoid membrane, and is the light saturation effect taking place, based on my results.
Practitioners of homeopathic medicine believe that toxic substances, appropriately diluted, can have healing effects, usually having the opposite effect of symptoms of the original toxic compound.
Which of the following statements about DNA replication is true? Okazaki fragments are DNA fragments synthesized on the leading strand. Single?strand binding proteins stabilize the open conformation of the unwound DNA.
Heterozygous black guinea pigs (Bb) are crossed among themselves. What is the probability of producing two black & three white offspring in any order?
Organism Profile
Calculate g and k in a growth experiment in which a medium was inoculated with 4.7 x 104 E. coli cells, and following a 1-hour lag, grew exponentially for 5 hours, after which the population was 5.4 x 107 cells/ml.
What is the functional difference between ventricular hypertrophy due to exercise and hypertrophy due to congestive heart failure?
What is the most likely explanation for the segregation of wild-type and mutant mice in the F2? Are the naked and hairless mutations alleles for the same gene?
Male frogs give calls that attract female frogs to approach and mate. Researchers reviewed mating calls of closely related tree frogs in South America.
The purpose of this exercise is to demonstrate the comparative effect of UV on three bacterial populations. This could have been accomplished without a cardboard or plastic cover. Why was the cover used?
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