在线观看亚洲精品专区-在线观看亚洲免费-在线观看亚洲免费视频-在线观看亚洲欧美-欧美freexxx-欧美free嫩交video

食品伙伴網(wǎng)服務(wù)號
 
 
當(dāng)前位置: 首頁 » 專業(yè)英語 » 專業(yè)知識 » 正文

What is DNA?

放大字體  縮小字體 發(fā)布日期:2007-10-06
核心提示:DNA is present in all cellular organisms and in viruses. It contains the genetic information of the organism. DNA, the abbreviation for Deoxyribonucleic Acid, consists of two antiparallel chains (double helix) consisting of sugar, a phosphate-unit a

DNA is present in all cellular organisms and in viruses. It contains the genetic information of the organism. DNA, the abbreviation for Deoxyribonucleic Acid, consists of two antiparallel chains (double helix) consisting of sugar, a phosphate-unit and 4 different bases. The two chains are held together by hydrogen bonds between base pairs, while the sugar-phosphate backbone is on the outside. The sugar-phosphate backbone stays the same within a strand, whereas the bases can differ between Adenine, Thymine, Guanine and Cytosine. The order of the bases in the double-chain determines the genetic code, that means the order and the distribution of the bases is responsible for all heritable traits of an organism. It is a very precise code, and a mistake in even a single letter of the DNA code can have disastrous consequences.

  A unit (sequence of nucleotides) of the double-helical chain, responsible for a certain trait, is called a gene.

更多翻譯詳細(xì)信息請點擊:http://www.trans1.cn
 
關(guān)鍵詞: DNA
[ 網(wǎng)刊訂閱 ]  [ 專業(yè)英語搜索 ]  [ ]  [ 告訴好友 ]  [ 打印本文 ]  [ 關(guān)閉窗口 ] [ 返回頂部 ]
分享:

 

 
推薦圖文
推薦專業(yè)英語
點擊排行
 
 
Processed in 4.967 second(s), 887 queries, Memory 3.35 M
主站蜘蛛池模板: 日本大片免费一级 | 亚洲综合成人网 | 日本一区二区在线视频 | 国产精品天天看天天爽 | 91伊人久久大香线蕉 | 啪啪午夜免费 | 奇米影视大全 | 久久精品免费观看 | 国产精品午夜在线观看 | 色月丁香 | 欧美黄色成人 | 国产日韩精品欧美一区色 | 亚洲一二三区视频 | 国模网站 | 欧美一级在线全免费 | 亚洲色图激情 | 性欧美xxxx乳高跟 | 俺去啦五月| 黄色在线观看网站 | 手机看片中文字幕 | xxxx久久| 毛片三级在线观看 | 35qao强力打造免费上线高清 | 手机在线完整视频免费观看 | 电影天堂在线观看三级 | 69国产成人综合久久精品 | 国产成人啪午夜精品网站男同 | 亚洲一级免费毛片 | 日韩毛片在线看 | 国产精品二区三区免费播放心 | 黄乱色伦 | 亚洲精品欧洲久久婷婷99 | 国产美女在线免费观看 | 免费看欧美一级特黄α大片 | 久久国产精品免费网站 | 狠狠色狠狠色综合日日小蛇 | 国产69精品久久久久9牛牛 | 人人看人人干 | 午夜影视网 | 玖玖国产在线观看 | 在线观看精品视频看看播放 |