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SSS 2008-05-05

时间:2010-05-14 00:59来源:互联网 提供网友:0922013129   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific American's 60-Second Science, I’m Steve Mirsky. Got a minute?

Biologists often attempt to construct a genealogy1 that shows the relationships of all life on earth.  One well-accepted effort compares the nucleic acid sequences that code for ribosomal RNA and a few proteins in many different organisms.  The result shows clear groupings.  The bacteria cluster together, the eukaryotes—that’s you and frogs and maple2 trees—all go together.  And archae, a distinct kind of single cell, go together.  A few years ago, researcher Song Yang decided3 to look at similarly shaped regions of proteins in various organisms.  Yang’s mentor4, Russell Doolittle, discussed the work at an evolutionary5 biology conference on May 1st at Rockefeller University in New York City.  Yang compared the DNA6 sequences of the similarly shaped protein sections.  The resulting map of relationships almost completely matched the one made from different data sources.  Which is good confirmation7 that the genealogy of life on earth is indeed what researchers thought it was.

Thanks for the minute for Scientific American's 60-Second Science. I'm Steve Mirsky.


点击收听单词发音收听单词发音  

1 genealogy p6Ay4     
n.家系,宗谱
参考例句:
  • He had sat and repeated his family's genealogy to her,twenty minutes of nonstop names.他坐下又给她细数了一遍他家族的家谱,20分钟内说出了一连串的名字。
  • He was proficient in all questions of genealogy.他非常精通所有家谱的问题。
2 maple BBpxj     
n.槭树,枫树,槭木
参考例句:
  • Maple sugar is made from the sap of maple trees.枫糖是由枫树的树液制成的。
  • The maple leaves are tinge with autumn red.枫叶染上了秋天的红色。
3 decided lvqzZd     
adj.决定了的,坚决的;明显的,明确的
参考例句:
  • This gave them a decided advantage over their opponents.这使他们比对手具有明显的优势。
  • There is a decided difference between British and Chinese way of greeting.英国人和中国人打招呼的方式有很明显的区别。
4 mentor s78z0     
n.指导者,良师益友;v.指导
参考例句:
  • He fed on the great ideas of his mentor.他以他导师的伟大思想为支撑。
  • He had mentored scores of younger doctors.他指导过许多更年轻的医生。
5 evolutionary Ctqz7m     
adj.进化的;演化的,演变的;[生]进化论的
参考例句:
  • Life has its own evolutionary process.生命有其自身的进化过程。
  • These are fascinating questions to be resolved by the evolutionary studies of plants.这些十分吸引人的问题将在研究植物进化过程中得以解决。
6 DNA 4u3z1l     
(缩)deoxyribonucleic acid 脱氧核糖核酸
参考例句:
  • DNA is stored in the nucleus of a cell.脱氧核糖核酸储存于细胞的细胞核里。
  • Gene mutations are alterations in the DNA code.基因突变是指DNA密码的改变。
7 confirmation ZYMya     
n.证实,确认,批准
参考例句:
  • We are waiting for confirmation of the news.我们正在等待证实那个消息。
  • We need confirmation in writing before we can send your order out.给你们发送订购的货物之前,我们需要书面确认。
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