【判断题】In E. coli, DNA replication begins at a unique site, oriC, in the genome.
【单选题】皮肤干燥.毛囊角化是与下列哪种营养素缺乏有关
【单选题】A mutant of E. coli with a heat-sensitive DNA ligase (25℃ permissive, 37℃ nonpermissive) has been used to show that DNA synthesis is discontinuous. Examination of DNA replication in the presence of [3...
A.
The accumulation of short segments of unlabeled DNA at 25 ℃ and at 37 ℃ .
B.
The accumulation of short segments of unlabeled DNA at 25 ℃ but not at 37 ℃ .
C.
The accumulation of short segments of radioactive DNA at 37 ℃ but not at 25 ℃.
D.
The incorporation of short fragments of radioactive DNA into longer ones at 25 ℃ and at 37 ℃ .
【判断题】若想将Word 2010中的一段文本复制到其他地方,必须先选中这段文本。
【简答题】心理咨询的终极目标的含义是() (A)多层次统一 (B)目标积极有效 (C)近期目标与远期目标的整合 (D)完善求助者的人格
【多选题】安全流变突变模型整个系统分为( )几个层次。