问题
问答题 简答题
如图4表示运用基因工程技术生产胰岛素的三条途径。据图结合所学知识回答下列问题：
为了便于将含有目的基因的细胞筛选出来，所选择的质粒上应该具有（）。
答案
参考答案：
标记基因
解析：
质粒作为载体一般具有三个条件：有复制原点、有目的基因插入点、有标记基因。标记基因可以是抗生素抗性基因、荧光标记基因等.它有利于目的基因的检测。
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如图4表示运用基因工程技术生产胰岛素的三条途径。据图结合所学知识回答下列问题：
为了便于将含有目的基因的细胞筛选出来，所选择的质粒上应该具有（）。
参考答案：
标记基因
解析：
质粒作为载体一般具有三个条件：有复制原点、有目的基因插入点、有标记基因。标记基因可以是抗生素抗性基因、荧光标记基因等.它有利于目的基因的检测。
Food is very important . Everyone needs to 1 well if he or she wants to have a strong body. Our minds also need a kind of food. This kind of food is 2 . We begin to get knowledge even 3 we are very young. Small children are interested in 4 around them . They learn 5 while they are watching and listening . When they are getting older , they begin to 6 story books , science books …,anything they like .When they find something new , they love to ask questions and try to find out the 7 . What is the best 8 to get knowledge ? If we learn by ourselves , we will get 9 knowledge . If we are 10 getting answers from others and do not ask why, we will never learn well .When we study in the right way, we will learn more and understand better .
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