下列有关基因工程的叙述,正确的是:(  )  A.DNA连接酶的作用

下列有关基因工程的叙述,正确的是:(  ) 

A.DNA连接酶的作用是将两个黏性末端的碱基连接起来

B.目的基因导入受体细胞后,受体细胞即发生基因突变

C.目的基因与运载体结合的过程发生在细胞外

D.常使用的运载体有大肠杆菌、噬菌体和动植物病毒等

答案

C

相关题目

Beijing Opera is also called Peking Opera.. It came into being after 1790 when
Beijing Opera is also called Peking Opera.. It came into being after 1790 when the famous four  Anhui opera troupe(戏班) came to Beijing. Its music and singing(唱腔) came from Xipi and Er-huan
(08年新建二中二模理) 已知直线与函数的图像有且只有两
(08年新建二中二模理) 已知直线与函数的图像有且只有两个公共点,若这两个公共点的横坐标分别为,且,则下列结论中正确的是(    ).    A.     B. 
                
                
The cloud never hides the sun. The truth will be known to all____.     
The cloud never hides the sun. The truth will be known to all____.                A.on time                       B.in time      C.by time    
(10分)某实验小组利用如图甲所示的气垫导轨实验装置来探
(10分)某实验小组利用如图甲所示的气垫导轨实验装置来探究合力一定时,物体的加速度与质量之间的关系。 (1)做实验时,将滑块从图甲所示位置
—______ do you water the plants, Miss Yang? —Twice a day. A.How much  
—______ do you water the plants, Miss Yang? —Twice a day. A.How much            B.How soon           C.How often
Working people in Hong Kong are always busy in the daytime. They don’t have e
Working people in Hong Kong are always busy in the daytime. They don’t have enough time to enjoy themselves. If you are one of those people, come and join us! We’ll take a night-time cruise (乘
____ that he was in great danger, Eric walked deeper into the forest. A.Not real
____ that he was in great danger, Eric walked deeper into the forest. A.Not realized      B. Not to realize        C. Not realizing      D. Not to have realized  

最新题目