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雅思阅读真题下载:DNA可洗掉
时间:2014-02-18 17:43来源:嘉卓留学 责任编辑:admin 点击:

  下载文件内容简介:雅思阅读真题:Don't wash those fossils!

  雅思阅读真题:DNA可洗掉

  How shops can exploit people's herd mentality to increase sales

  Standard museum practice can wash away DNA.

  1.Washing, brushing and varnishing fossils — all standard conservation treatments used by many fossil hunters and museum curators alike — vastly reduces the chances of recovering ancient DNA.

  2.Instead, excavators should be handling at least some of their bounty with gloves, and freezing samples as they are found, dirt and all, concludes a paper in the Proceedings of the National Academy of Sciences today.

  3.Although many palaeontologists know anecdotally that this is the best way to up the odds of extracting good DNA, Eva-Maria Geigl of the Jacques Monod Institute in Paris, France, and her colleagues have now shown just how important conservation practices can be. This information, they say, needs to be hammered home among the people who are actually out in the field digging up bones......……

        Answer the following questions by using NO MORE THAN THREE WORDS for each answer.

  1.How did people traditionally treat fossils?

  2.What suggestions do Geigl and her colleagues give on what should be done when fossils are found?

  3.What problems may be posed if fossil bones are washed on-site? Name ONE.

  4.What characteristic do fossil bones have to make them susceptible to be contaminated with contemporary DNA when they are washed?.…………

 

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