[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f_WWnK8Dnq94axTInTi49j0CPA1d3gCbOZCskShfMngM":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2024-10-27 23:14:07",163406579,[8,9,10,11],"当两个loxp位点反向位于两条链上时,它所起的作用是让两条链上的序列互换","当两个loxp位点同向位于两条链上时,它所起的作用是让两条链上的序列互换","当两个loxp位点同向位于一链上时,可以切除 两个loxp位点中间的基因序列","当两个loxp位点反向位于一链上时,可以使\b两个loxp位点中间的基因序列倒置",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},14,"b8a88b9fa45f3eacc05d4dc03140e889","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F8f6d1861c2d7225ca42808692d75026e.jpg","基因工程","work_38004443","第九章 \b作业","在Cre-loxp 系统的三种模式中,下列哪个是\b错误的",[21,32,41,50,59,62,71,82,90,95],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],163406575,[25,26,27,28],""如来神掌"",""小李飞刀"",""上古神器"",""大力水手"","分子生物学界把CRISPR比喻成什么","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],163406576,[36,37,38,39],"Cre-loxp 系统","TALEN打靶","CRISPR CAS9","RNA干扰","分子生物学界\b被喻为"小李飞刀"的是什么",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],163406577,[45,46,47,48],"DNA与DNA相互作用","DNA与RNA相互作用","RNA与RNA相互作用","蛋白与RNA相互作用","RNAi序列识别是通过什么实现的",{"answer":51,"createTime":5,"id":52,"options":53,"question":58,"source":30,"type":31},[],163406578,[54,55,56,57],"是否能够成功多半取决于研究者的技术和水平","传统的基因敲除付出的时间相当漫长,劳动繁琐、费用高昂","传统的基因敲除可以用受精卵细胞和ES细胞,所以效率是很高的","Cre-loxp系统下的条件基因敲除小鼠效率很高,所以它不是传统的基因敲除技术范畴","关于传统基因敲除\b描述\b正确的是哪个",{"answer":60,"createTime":5,"id":6,"options":61,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":63,"createTime":5,"id":64,"options":65,"question":70,"source":30,"type":31},[],163406580,[66,67,68,69],"比方说EcoR1识别GAATTC序列,但是这段序列理论上每隔4的6次方个碱基就会出现一次,即每隔4096个碱基就会有一个位点,它几乎会使每个基因都被切断","限制性内切酶只能切割特定的序列,并不一定能切目的基因","限制性内切酶不能随意进入靶细胞中行使切割功能","限制性内切酶的mRNA不能在靶细胞中正确翻译出有活性的内切酶","在新型打靶技术中,要能特异性识别DNA并切断它,限制性内切酶\b为什么不能用来切断DNA",{"answer":72,"createTime":73,"id":74,"options":75,"question":80,"source":30,"type":81},[],"2024-10-27 23:18:01",163407215,[76,77,78,79],"繁琐的劳动","高昂的费用","同源重组概率低","中靶ES细胞要凑巧发育成生殖细胞且刚好成功受精的机率很低","传统基因敲除的不足有哪些",1,{"answer":83,"createTime":73,"id":84,"options":85,"question":88,"source":30,"type":89},[],163407216,[86,87],"正确","错误","条件基因敲出中的"条件"是指特定的时间和特定的细胞",3,{"answer":91,"createTime":73,"id":92,"options":93,"question":94,"source":30,"type":89},[],163407217,[86,87],"Cre-loxp 系统是指Cre重组酶,只要发现在任何一条DNA链上存在两个34个碱基长度反向重复序列(命名为LOXP位)点,不管这两个loxp位点是正向还是反向,都可以切去中间的DNA序列",{"answer":96,"createTime":73,"id":97,"options":98,"question":99,"source":30,"type":89},[],163407218,[86,87],"DNA断点处的同源重组率增高,以及非同源重组修复错误,可以帮助我们改造特定的基因"]