【简答题】Why did the farmer say to the doctor 'Here I am again'? Because he wanted to make the doctor believe that he was not ______.
【简答题】The author took his son to the doctor because he had broken
【简答题】One morning, Bill said he was ill. His mother called a taxi and took him to the doctor. The doctor asked Bill, “What’s the matter, young man?” Bill answered, “I’m feeling sick. I’m coughing(咳嗽) and ha...
【判断题】无菌操作就是在医疗操作过程中注意防止微生物污染或感染。
【多选题】有关RNA转录的终止描述正确的是( )
A.
DNA 上的特定终止信号对转录终止进行严密控制,这个信号是基因末端的一段特殊序列 —— 终止子
B.
大肠杆菌细胞内存在两类终止子,不依赖于Rho( ρ )因子的终止子和依赖 Rho( ρ )因子的终止子
C.
不依赖于Rho( ρ )因子的终止子转录终止点前有一段富含G-C的回文序列,形成强的发卡结构,其次下游富含T,我们也称为强终止子。
D.
依赖 Rho( ρ )因子的终止子也含有回文序列,但是G-C含量少,因而不稳定,其次下游也缺乏T,需要 ρ 因子的帮助才能终止转录
E.
转录 终止时, ρ 蛋白首先结合于新生的RNA链,借助ATP水解提供能量沿新生链移动并追赶上RNA聚合酶,利用自己的解旋酶活性使RNA-DNA解链,终止转录。将产物RNA从模板DNA上释放出来。
【单选题】According to the doctor, what is the most proper way for the man to keep fit?
A.
Going regularly to a gym.
B.
Taking the right medicine.
C.
Keeping a close watch on his weight.
D.
Taking walks regularly.
【判断题】无菌操作就是在医疗操作过程中注意防止微生物污染或感染
【单选题】为使汽车车轮在路面上不打滑,附着力与牵引力的大小关系必须为()