更多"By saying 'DNA testing is not an un"的相关试题:
[单项选择]What does tile writer mean by saying "we pay for our sensitivity" in the first paragraph()
A. We have to take care of our sense of pain.
B. We suffer from our sense of feeling.
C. We should try hard to resist pain.
D. We are hurt when we feel pain.
[单项选择]By saying that technical terms "on the outskirts of the English language than... ", the writer implies that______.
A. they are used in the urban areas
B. they are used in the rural areas
C. they do not constitute the core of common speech
D. they are not understood by English farmers
[单项选择]By saying "... but the impact of a degree washes out after five years" (Para. 3), the author means______
[单项选择]DNA是
A. 脱氧核糖核苷
B. 脱氧核糖核酸
C. 核糖核酸
D. 脱氧核糖核苷酸
E. 核糖核苷酸
[单项选择]英译汉:“moisture proof packaging; shock proof packaging; vacuum packaging”( )
A. 防潮包装;防震包装;真空包装
B. 防锈包装;防震包装;无渗漏包装
C. 防潮包装;防锈包装;真空包装
D. 无渗漏包装;防震包装;真空包装
[单项选择]人工DNA重组中催化外源DNA与载体DNA连接的酶是( )
A. 限制性内切酶
B. 限制性外切酶
C. DNA连接酶
D. DNA聚合酶
E. Taq酶
[判断题]大肠杆菌参与DNA错配修复的DNA聚合酶是DNA聚合酶Ⅰ。
[单项选择]在DNA生物合成中,具有催化RNA指导的DNA聚合反应,RNA水解及DNA指导的DNA聚合反应三种功能的酶是
A. DNA聚合酶
B. RNA聚合酶
C. 逆转录酶
D. 连接酶
[单项选择]在DNA生物合成中,具有催化RNA指导的DNA聚合反应,RNA水解及DNA指 导的DNA聚合反应三种功能的酶是
A. DNA聚合酶
B. RNA聚合酶
C. 反转录酶
D. 连接酶
[单项选择]进行DNA复制实验时,保留全部DNA复制体系成分,但以DNA聚合酶Ⅱ代替DNA连接酶,试分析可能会出现什么后果
A. DNA高度缠绕,无法作为模板
B. DNA被分解成无数片段
C. 无RNA引物,复制无法进行
D. 随从链的复制无法完成
E. 冈崎片段生成过量
[单项选择] DNA复制需要: (1)DNA聚合酶Ⅲ; (2)解链蛋白; (3)DNA聚合酶Ⅰ; (4)DNA指导的RNA聚合酶; (5)DNA连接酶参加。 其作用的顺序是:()
A. (4)(3)(1)(2)(5)
B. (4)(2)(1)(3)(5)
C. (2)(3)(4)(1)(5)
D. (2)(4)(1)(3)(5)
[单项选择]在DNA提取过程中,沉淀DNA用
A. 无水乙醇
B. 乙醚
C. 氯仿
D. 戊醇
[单项选择]原核生物DNA复制中①DNA聚合酶Ⅲ,②解链酶,③DNA聚合酶I,④DNA指导的RNA聚合酶,⑤DNA连接酶,⑥SSB,的作用顺序是
A. ④③①②⑤⑥
B. ②③⑥④①⑤
C. ④②①⑤⑥③
D. ④②⑥①③⑤
E. ②⑥④①③⑤
[单项选择]DNA不是
A. DNA复制的模板
B. RNA转录的模板
C. 遗传的物质基础
D. 蛋白质合成的模板
E. 基因的结构基础
[单项选择]DNA复制需要:①DNA聚合酶Ⅲ;②解链蛋白;③DNA聚合酶Ⅰ;④DNA指导的RNA聚合酶;⑤DNA连接酶。其作用的顺序是
A. ④,③,①,②,⑤
B. ②,③,④,①,⑤
C. ②,④,①,③,⑤
D. ④,②,①,③,⑤