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在临近高考的复习中,有些学生由于基础不牢,学习压力大,情绪又很浮躁,对以往复习过的知识会记忆模糊,经常把相近或相关联的一些概念混淆,导致在做习题或课上回答问题时出现不该犯的错误。笔者把学生易混淆易误解的一些知识点进行如下总结。一、“启动子”与“起始密码”的区别首先二者位置不同,“启动子”位于DNA分子上,“起始密码”位于mRNA分子上。“启动子”是DNA分子上的一段短核苷酸序列,位于基因的编码区上游的非编码区,它的作用是
In the review near the college entrance examination, some students because of the foundation is not strong, the pressure of learning, emotional and very impetuous knowledge of the past will be recalled memory fuzzy, often similar or related concepts confused, resulting in exercises or classes There was a mistake that should not be made when answering questions. The author summarizes some of the points that students are confused with and misunderstood as follows. First, the difference between “promoter ” and “start password ” First of all, the two are different in position, “promoter ” is located on the DNA molecule, “start code ” is located on the mRNA molecule. “Promoter ” is a short DNA sequence on the DNA molecule located in the non-coding region upstream of the coding region of the gene. Its function is