碱基类似物
参考答案:
是一类与正常碱基结构类似的化合物,在DNA复制时可取代正常碱基掺入并与互补链上碱基配对,从而引起碱基对的置换
缺词填空。
Today is Jack’s birthday. He 1. l_____ cool in a new shirt and a pair of
2. j_____. 3. T_____ some drinks and food on the table. His friends have
4. l_____ of birthday gifts (礼物) 5. f_____ him---CDs, chocolate, toys and
6. c_____ books. He is glad to see so many nice things. Some 7. o_____ his
friends stand beside the table and 8. s_____ the nice food with him. Some sit on
the sofa and chat with each 9. o_____. Everyone has fun at the 10. p_____.
2009年12月1日,欧盟宪法正式生效。从此以后,世界上将有一个可以代表整个欧盟说话的人。下列对欧洲联盟的叙述,错误的是[ ]
A.增强了与美国争夺世界霸权的力量
B.有利于世界多极化的发展
C.有利于协调欧盟国家之间的关系
D.提高了欧洲国家在国际上的地位