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GRE阅读真题下载:分子生物、黑人作家
时间:2014-02-18 17:05来源:嘉卓留学 责任编辑:admin 点击:

  下载文件内容简介:GRE阅读真题(第一篇关于分子生物,第二篇是关于黑人作家。)

  GRE阅读真题:分子生物

  It is well known that biological changes at the molecular level have morphogenetic consequences, consequences affecting the formation and differentiation of tissues and organs. It is superfluous to point out (point out: v.指出) that gene mutations and disturbances of the bio-synthetic processes in the embryo may result in abnormalities in the morphology (structure) of an organism. However, whereas much is known about causes and consequences at the molecular level, and in spite of an enormous accumulation of chemical and morphological data on embryos of various kinds, our understanding of how genes control morphogenesis is still far from complete. Perhaps one reason for this is that molecular biologists and morphologists speak different languages. Whereas the former speak about messenger-RNA and conformational changes of protein molecules, the latter speak of ectoderms, hypoblasts, and neural crests......……
 

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