图中a、b、c、d代表的结构，正确的是_刷题宝

题干

图中a、b、c、d代表的结构，正确的是（）

A：a﹣质粒RNA

B：b﹣限制性核酸外切酶

C：c﹣RNA聚合酶

D：d﹣外源基因

上一题下一题 0.0难度选择题更新时间:2018-10-18 08:23:05

答案(点此获取答案解析）

D

同类题1

我们的生活条件越来越好，真是（）啊！

同类题2

已知集合M={x|x²﹣2x﹣3＜0}和N={x|x＞1}的关系如图所示，则阴影部分所表示的集合为____．

同类题3

实验中学编导兴趣小组准备剪辑一部反映1949年共和国诞生的微电影。其中，标志着“中国历史新纪元”可选的事件是（）

同类题4

Mr. Jackson is a teacher of science in a middle school. His students like his classes because his classes are very interesting. They can learn a lot in his class. The students can make（制作）many things. His little son Val also likes making things. He makes lots of machines（机器）, such as a machine like a man. It can do the job that is dangerous（危险的）for people to do. He says, “I want to be a scientist.”
根据短文内容，选择正确答案。

同类题5

我国农业中最重要的部门是（　　）

小学学科试题库

初中学科试题库

高中学科试题库