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GRE阅读题目解析:低重力环境下结晶蛋白质实验

2017-02-20 12:12:22来源：网络

　　【GRE阅读题目解析:低重力环境下结晶蛋白质实验】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:肾上腺素，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:低重力环境下结晶蛋白质实验

　　P1

　　An experiment conducted aboard Space Lab in 1983 was the first attempt to grow protein crystals in the low-gravity environment of space. That experiment is still cited as evidence that growing crystals in microgravity can increase crystal size: the authors reported that they grew lysozyme protein crystals 1,000 times larger than crystals grown in the same device on Earth. Unfortunately, the authors did not point out that their crystals were no larger than the average crystal grown using other, more standard techniques in an Earth laboratory. No research has yet produced results that could justify the enormous costs of producing crystals on a large scale in space. To get an unbiased view of the usefulness of microgravity crystal growth, crystals grown in space must be compared with the best crystals that have been grown with standard techniques on Earth. (139 words)

　　1.It can be inferred from the passage that the author would find the Space Lab experiment more impressive if which of the following were true?

　　(A) The results of the Space Lab experiment could be replicated in producing other kinds of crystals in addition to lysozyme protein.

　　(B) The device used in the experiment produced larger crystals on Earth than it did in space.

　　(C) The size of the crystals produced in the experiment exceeded the size of crystals grown in Earth laboratories using standard techniques.

　　(D)The cost of producing the crystals in space exceeded that of producing them using standard laboratory techniques.

　　(E) The standard techniques used in Earth laboratories were modified in the Space Lab experiment due to the effects of microgravity.

　　2.Which of the following can be inferred from the passage about the device used to grow crystals in the Space Lab experiment?

　　(A) The device is more expensive to manufacture than are the devices used in standard techniques in an Earth laboratory.

　　(B) The device has not been used to grow crystals in space since the Space Lab experiment of 1983.

　　(C) Crystals grown in the device on Earth tend to be much smaller than crystals grown in it in space.

　　(D) Crystals grown in the device in space have been exceeded in size by crystals grown in subsequent experiments in space using other devices.

　　(E) The experiments in which the device was used were conducted with proper controls.

　　点击下一页查看答案：

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