题目内容

关于外显子和内含子叙述错误的是()

A. 外显子是基因中编码序列,并表达为成熟RNA的核酸序列
B. 外显子能转录,内含子不能转录
C. 去除内含子,连接外显子的过程叫剪接
D. 基因中外显子和内含子相互间隔排列

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下列关于mRNA的叙述正确的是()

A. 3’末端含有CCA-OH
B. 5’末端有“帽子”结构
C. 含许多稀有碱基
D. 二级结构呈三叶草型

不参与肽链延长的因素是()

A. mRNA
B. 水解酶
C. 转肽酶
D. GTP

以下关于cAMP对原核基因转录的调控作用的叙述错误的是()

A. cAMP可与分解代谢基因活化蛋白(CAP)结合成复合物
B. 葡萄糖充足时,cAMP水平不高
C. 葡萄糖和乳糖并存时,细菌优先利用乳糖
D. 葡萄糖和乳糖并存时,细菌优先利用葡萄糖

12.3 Which of the following statements is/are correct? (i) A by-product is a product produced at the same time as other products which has a relatively low volume compared with the other products. (ii) Since a by-product is a saleable item it should be separately costed in the process account, and should absorb some of the process costs. (iii) Costs incurred prior to the point of separation are known as common or joint costs.

A. (iii) only
B. (i) and (iii)
C. (ii) and (iii)
D. (i) and (ii)