江西省万载县高中生物专题1基因工程1.1DNA重组技术的基本工具(练习课)教案新人教版选修3.doc

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1 -1.1 DNA 重组技术的基本工具(练习课)教学目标 复习巩固所学知识,培养学生运用知识的能力重点 查缺补漏,培养学生运用知识的能力难点 查缺补漏,培养学生运用知识的能力教学过程 时间 设计意图 个人备课知识点总结1、基因工程的概念2、限制性核酸内切酶“分子手术刀”3、 、 “分子缝合针” DNA 连接酶4、载体需要的条件5、基因工程中常用的载体质粒:二、习题讲解世纪金榜课时检测区 P4三、习题巩固下图所示的酶 M 和酶 N 是两种限制酶,图中 DNA 片段只注明了黏性末端处的碱基种类,其他碱基的种类未注明。(1)酶 M 特异性切割的 DNA 片段是 ,则酶 N 特异性切割的 DNA 片段是_。(2)多个片段乙和多个片段丁混合在一起,用 DNA 连接酶拼接得到环状 DNA,其中只由两个 DNA 片段连接成的环状 DNA 分子有_种。答案:(1) (2)33402总结知识点,加深对本课的理解讲解练习,培养学生运用知识的能力通过练习巩固,进一步加深对本课的掌握- 2 -【误区警示】(1)限制酶识别的序列一般是特定的回文核苷酸序列;DNA 连接酶连接的是相同或互补的黏性末端,而有的DNA 连接酶连接平末端后也会形成特定的回文序列。(2)同一种限制酶一定能切出相同的黏性末端,相同的黏性末端不一定来自同一种限制酶的切割,但同样能相互连接。 教学反思

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