DNA（脱氧核糖核酸）是细胞核内包含遗传信息的分子。提取DNA涉及一系列步骤，以轻轻地打开细胞，打开核膜，从蛋白质中分离出DNA，然后使其从溶液中沉淀出来。根据膜的结构，DNA及其电负性，使用各种化学物质即可完成此操作。脱除蛋白质后，可使用氯化钠或其他含钠化合物稳定DNA，并有助于沉淀。

DNADEJIBENJIEGOUSHILIANGTIAOZHANGLIANHEGANSUAN，ZHOUWEIHUANRAOZHETANGLINSUANGUJIA。DNATONGGUOZISHENNIUQUHEPANRAOJINYIBUPAILIE，BINGBANYOUGEZHONGDANBAIZHI，YIBAOCHILIANDEZUZHIHEJIEKAI。ZAIQITIANRANZHUANGTAIXIA，**JIEJINHUANJINGDEDNABUFENSHITANGLINSUANGUJIA。ZAILAOFANGNEI，GAIHUANJINGZHUYAOSHISHUI。DNAZAIQIZHONGKERONG。YOUYUQIZHENGTIJIXING，TAKERONGYUSHUI。

“JIXING”SHIHUAXUESHUYU，MIAOSHULEBAOHANBUJUNYUNDIANHEFENBUDEFENZI。GENJUKANGNAIERYIXUEYUANDEPaul ZumboSUOSHUO，SUOYOUHESUANDOUSHIJIXINGDE。DUIYUDNA，GUJIASHANGDEGAOJIXINGLINSUANJITUANDAIYOUFUDIANHE。GAIXINGZHIJIESHILESHUIRONGXING，YINWEISHUIYESHIJIXINGDE。SHUIDEZHENGDIANHEYUDNADEFUDIANHEXIANGHUZUOYONG，XINGCHENGRONGYE。WEILEHUISHOUDNAYIJINXINGJINYIBUCESHIHUOKESHIHUA，**YONGSHUIJIANGDNACONGRONGYEZHONGCHENDIANCHULAI。YOUYUSHUIJUYOUXIANGDUIRUODEZHENGDIANHE，YINCIKEYITONGGUOZAIRONGYEZHONGTIGONGGENGQIANGDEDAIZHENGDIANDELIZILAISHIXIAN。NASHI**LIXIANGDEXUANZE。

YIDANDNACONGXIBAOHEZHONGYICHUBINGYUSHUIHUNHE，NALIZIDEYINRUJIUHUIZAINAHEGUJIAZHIJIANCHANSHENGZANSHIDEXIYINLI。DNABEIZANSHIZHONGHE，RANHOURONGYICONGSHUIZHONGJIELI。ZAIZHEIYIJIEDUAN，YOUYUJIUJINGSHIFEICHANGFEIJIXINGDE，YINCIYINRUJIUJINGPOSHIDNAHENALIZIZHIJIANDEJIEHEGENGJIAJINMI。KEYISHIYONGYICHUNHUOYIBINGCHUN。YIDANDNACONGSHUIZHONGJIELIBINGYUNAJINMIJIEHE，TAJIANGCONGRONGYEZHONGCHENDIANCHULAI，KEYIJIANGQINONGSUOYIJINXINGCHUNHUA，YEKEYITONGGUOJIANGQIQINGQINGDIRAOZAIGUANGHUADEBOLIBANGSHANGJINXINGKESHIHUA。

FENJIEZHIMOHEHEMOYICONGXIBAOZHONGHUOQUDNATONGCHANGSHITONGGUO**XIANYINRUMOUZHONGQUWUJILAIFENJIEZHIZHIFENZILAIWANCHENGDE。SHIYANSHIZHONGCHANGYONGDEXIDIJISHISDSHUOSHIERWANJILIUSUANNA。DANSHIDUIYUJIANDANDETIQU，SHENZHIKEYISHIYONGXIJIEJING。RUGUOXIBAOLAIYUANYUZHIWUCAILIAO，TONGCHANGHAITIANJIAMEILAIXIAOHUAXIBAOBI。