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SSS 2008-03-21

时间:2010-05-13 05:49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 am Karen Hopkin, this will just take a minute.

If you’ve ever given any thought to the life style of the hermaphrodite, it’s probably occurred to you that being both male and female1 doubles your chances of having a date on the Saturday night. Yeah it’s an old joke, but it's sort of true. Because most hermaphrodites do have to date. In other words, they can't simply fertilise themselves. If they could, I am sure they would. So what actually stops them? I mean what keeps hermaphrodite from mixing together its own sperm2 and eggs and then staying home to watch TV? In the March 20 online issue of Science, researchers from Japan revealed3 the answer. They were studying the sea squirt, an animal that reproduces4 by spewing sperm and eggs into the water and leaving the rest to chance. Combing through the sea squirt genome, the Japanese scientists discovered two sets of genes5, one produces a protein found on the egg’s surface, the other makes a similar protein on sperm. When these molecular6 calling cards held from different animals, the proteins come together and allow fertilization to occur. when they are from the same animal, they politely shake hands and go to separate ways. Now if only humans had such a simple system for figuring out who to bring home to mother.

Thanks for the minute, for Scientific American's 60-Second Science, I am Karen Hopkin.
 


点击收听单词发音收听单词发音  

1 female 3kSxf     
adj.雌的,女(性)的;n.雌性的动物,女子
参考例句:
  • We only employ female workers.我们只雇用女工。
  • The animal in the picture was a female elephant.照片上的动物是头母象。
2 sperm jFOzO     
n.精子,精液
参考例句:
  • Only one sperm fertilises an egg.只有一个精子使卵子受精。
  • In human reproduction,one female egg is usually fertilized by one sperm.在人体生殖过程中,一个精子使一个卵子受精。
3 revealed 29a8fdd8696d7b677a37f8957897d3ff     
v.显示( reveal的过去式和过去分词 );揭示;泄露;[神学]启示
参考例句:
  • They revealed to me that the experiment had failed. 他们向我透露试验失败了。 来自《简明英汉词典》
  • His insincerity is revealed by the quick goggle of his eyes. 他眼睛的快速转动泄露了他的不诚。 来自《简明英汉词典》
4 reproduces 5205472e28f296b09e4c55cb49ae0aaf     
复制( reproduce的第三人称单数 ); 重现; 再版; 生殖
参考例句:
  • The computer reproduces the data as a set of diagrams. 电脑使这些数据再现为一系列图表。
  • The original reproduces clearly in a photocopy. 原件复印得十分清晰。
5 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
6 molecular mE9xh     
adj.分子的;克分子的
参考例句:
  • The research will provide direct insight into molecular mechanisms.这项研究将使人能够直接地了解分子的机理。
  • For the pressure to become zero, molecular bombardment must cease.当压强趋近于零时,分子的碰撞就停止了。
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TAG标签:   SSS  hermaphrodite
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