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GRE阅读题目解析:温血动物发病时体温升高

2017-06-15 09:53:00来源：网络

　　【GRE阅读题目解析:温血动物发病时体温升高】GRE考试考什么？GRE阅读是重点。新东方在线GRE频道为大家带来GRE阅读题目解析:温血动物发病时体温升高，答案见下一页，希望对大家GRE备考有所帮助。更多精彩尽请关注新东方在线GRE频道!

　　查看全部：GRE阅读答案解析(汇总)

　　GRE阅读题目解析:温血动物发病时体温升高

　　P5

　　Why during sickness should body temperature of warm-blooded animal rise? It has long been known that the level of serum iron in animals falls during infection. Garibaldi first suggested a relationship between fever and iron. He found that microbial synthesis of siderophores -- substances that bind iron -- in bacteria of the genus Salmonella declined at environmental temperatures above 37°C and stopped at 40.3°C. Thus, fever would make it more difficult for an infecting bacterium to acquire iron and thus to multiply. Cold-blooded animals were used to test this hypothesis. Kluger reported that of iguanas infected with the potentially lethal bacterium A. hydrophilia, more survived at temperatures of 42°C than at 37°C, even though healthy animals prefer the lower temperature. When animals at 42°C were injected with an iron solution, however, mortality rates increased significantly. (135 words)

　　9. According to the passage, Garibaldi determined which of the following?

　　(A) That serum iron is produced through microbial synthesis

　　(B) That microbial synthesis of siderophores in warm-blooded animals is more efficient at higher temperatures.

　　(C) That only iron bound to other substances can be used by bacteria.

　　(D) That there is a relationship between the synthesis of siderophores in bacteria of the genus Salmonella and environmental temperature.

　　(E) That bacteria of the genus Salmonella require iron as a nutrient.

　　10. If it were to be determined that similar phenomena occur in warm-blooded animals, which of the following, assuming each is possible, is likely to be the most effective treatment for warm-blooded animals with bacterial infections?

　　(A) Administering a medication that lowers the animals' body temperature

　　(B) Injecting the animals with an iron solution

　　(C) Administering a medication that makes serum iron unavailable to bacteria

　　(D) Providing the animals with reduced-iron diets

　　(E) Keeping the animals in an environment with temperatures higher than 37°C

　　点击下一页查看答案：

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