请输入或粘贴题目内容
搜题
拍照、语音搜题，请扫码下载APP
题目内容
（请给出正确答案）
取代型载体(replacement vector)是指同一种限制性内切核酸酶在λDNA中具有两个切点。外源DNA通过取代这两个切点间的片段被克隆。
答案
更多“取代型载体（replacement vector)是指同一种限制性内切核酸酶在λDNA中具有两个切点。外源DNA通过取代这两个切”相关的问题
第2题
The U.S. is trying to reduce joint replacement failure rate by______.
A．strictly controlling the number of replacement operations
B．asking hospitals to follow up each case for 12-18 months
C．setting up a national joint replacement database
D．sending doctors to be trained in Sweden
第6题
What, according to this passage, would be the major impact of the newer energy sources？
A．A reduction of the fuel consumed by conventional power stations.
B．A reduction of the manpower required by conventional power stations.
C．The total replacement of conventional power stations.
D．The total replacement of conventional energy sources.
第11题
According to the passage, double-paned windows______.
A．are energy efficient
B．can only be used as replacement
C．are only used in new buildings
D．will lower your heating costs by 50%
