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SSS 2008-01-22

时间:2010-05-13 01:01来源:互联网 提供网友:Suki12322   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific Americans' 60-Second Science.I'm Karen Hopkin .This will just take a minute.

When you hear things like, human DNA1 differs from chimp2 DNA by only a couple percent. You can’t help but wonder. How can that be? How can so few changes make such a big difference? Researchers working with fruit bats and mice think they have an answer. And it lies less in the animals’ genes4 than in the short snippets of DNA that control when and where and how vigorously genes are turned on. If you’ve ever thought that a bat is basically just a rodent5 with wings, you’re not too far from the mark. One of the most obvious differences between bats and mice is their forearms. Mice have these stubby legs, and bats have these large leathery wings. But even those differences are not as major as you might imagine. Mice and bats both have a gene3 called Prx one, which regulates limb development. But the gene is more active in the budding wings of bats. So the researchers took the piece of DNA that controls Prx one activity from a bat and stuck it into a mouse. The result pictured in the January 15 issue of Genes and Development- mice that have longer front legs. Ok, they didn’t spout6 wings, but the study shows that even small changes can have big consequences.

Thanks for the minute for Scientific Americans' 60-Second Science. I'm Karen Hopkin.

 


点击收听单词发音收听单词发音  

1 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。
2 chimp WXGza     
n.黑猩猩
参考例句:
  • In fact,the color of gorilla and chimp are light-color.其实大猩猩和黑猩猩的肤色是较为浅的。
  • The chimp is the champ.猩猩是冠军。
3 gene WgKxx     
n.遗传因子,基因
参考例句:
  • A single gene may have many effects.单一基因可能具有很多种效应。
  • The targeting of gene therapy has been paid close attention.其中基因治疗的靶向性是值得密切关注的问题之一。
4 genes 01914f8eac35d7e14afa065217edd8c0     
n.基因( gene的名词复数 )
参考例句:
  • You have good genes from your parents, so you should live a long time. 你从父母那儿获得优良的基因,所以能够活得很长。 来自《简明英汉词典》
  • Differences will help to reveal the functions of the genes. 它们间的差异将会帮助我们揭开基因多种功能。 来自英汉非文学 - 生命科学 - 生物技术的世纪
5 rodent DsNyh     
n.啮齿动物;adj.啮齿目的
参考例句:
  • When there is a full moon,this nocturnal rodent is careful to stay in its burrow.月圆之夜,这种夜间活动的啮齿类动物会小心地呆在地洞里不出来。
  • This small rodent can scoop out a long,narrow tunnel in a very short time.这种小啮齿动物能在很短的时间里挖出一条又长又窄的地道来。
6 spout uGmzx     
v.喷出,涌出;滔滔不绝地讲;n.喷管;水柱
参考例句:
  • Implication in folk wealth creativity and undertaking vigor spout.蕴藏于民间的财富创造力和创业活力喷涌而出。
  • This acts as a spout to drain off water during a rainstorm.在暴风雨季,这东西被用作喷管来排水。
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