【单选题】下列关于DNA甲基化的叙述,错误的是
C.
当某些基因的功能完成之后,甲基化可能有助于这些基因的关闭
D.
甲基化直接干扰转录因子与启动子中特定的结合位点的结合
【多选题】19-65.网络操作系统是指运行在服务器上,提供网络资源共享功能并负责管理整个网络的操作系统,下列可用作网络操作系统的有
【单选题】根据材料请回答 51~65 We know the kiss as a form. of expressing affection.But long before it became 51 ,it was the custom in many parts of the world to use the kiss as a(n) 52 of respect. In many African trib...
【简答题】I’m sorry you’ve been waiting so long, but it’ll still be some time _________ Brian gets.back. A.before B.since C.till D.after
【单选题】John thinks it won’t be long he is ready for his new job. ( )
【简答题】A.A hundred years ago. B.Three centuries ago. C.After America was discovered. D.Long before America was discovered.
【单选题】压力容器的制造方法多样,不同制造方式所成的容器有各自的特点,对于承压不高的中小型容器,可以采用技术较为成熟的( )方式制造:
【判断题】DNA甲基化程度与基因转录有关,甲基化程度越高,转录活性越高。
【判断题】DNA甲基化程度与基因转录有关,甲基化程度越高,转录活性越高。