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超1万多人点赞的DNA复制课件,限免下载3天

  • 2026-07-26 12:27:40
超1万多人点赞的DNA复制课件,限免下载3天

帧理SVG正在推出资源限免活动:每周推出3—5篇资源介绍推文。凡推文介绍的资源,自推文发布起进入3天限免,所有用户均可免费在线体验和下载

今天的限免资源是“DNA的复制”。这份资源的演示此前由我们发布在抖音,获得了1万多人点赞。这次把完整交互版本开放出来,老师可以自己拖动、暂停,看看它能不能解决课堂上那个最容易“背会了却没看懂”的环节。

DNA复制难讲的,不是结论多,而是时间过程被压扁了

学生往往能记住“新链只能沿5'→3'方向合成”,也能说出前导链连续、滞后链分段。但一让他解释为什么两条新链看起来朝着不同方向延伸,或者冈崎片段究竟从哪里开始形成,答案就容易重新变成术语拼接。

这不完全是知识点本身难,而是常用的静态示意图同时放进了解旋、聚合酶移动、新链延伸和片段形成。多个时刻叠在同一张图里,老师需要一边指方向、一边补时间顺序;学生看到的却常常只是几根箭头,很难建立“复制叉向前推进时,两个方向上的合成分别怎样发生”的连续表象。

资源中的DNA复制过程交互画面

让学生看到:滞后链不是“向后复制”,而是在不断完成新的片段

这个资源把同一个复制叉保留在画面中。随着解旋向前推进,上方的新链连续延伸;下方的聚合酶则会来到刚解开的区域,再朝相反方向完成一段新链,之后进入下一轮。前导链和滞后链不再是课本上的两个标签,而是同一条规则在两条反向平行模板上产生的两种过程。

老师可以直接播放完整过程,也可以暂停后拖动进度条,在任意阶段前后比较。这里最有用的不是把动画从头放到尾,而是把原本需要老师用语言补出来的先后关系,变成可以停住、倒回去、重新观察的课堂证据。

资源中的前导链、滞后链动态演示画面

课堂上,可以把“记方向”改成一次预测

使用时不必先把所有结论再讲一遍。老师可以把画面停在复制叉刚向前推进的位置,让学生预测:下一段滞后链会从哪里开始?聚合酶接下来朝哪个方向移动?预测之后再拖动进度条验证,最后要求学生只用“模板链反向平行”和“新链只能5'→3'合成”解释观察结果。

这样,动画承担的不是替老师讲知识,而是提供一个全班可以共同观察的过程。老师少画几次箭头、少补几遍时间顺序,学生则必须把记住的规则用于解释眼前的变化。至于这份在短视频里获得1万多人点赞的演示,放进真实课堂是否顺手,趁这三天打开完整版本试一次,比只看视频更容易判断。

DNA的复制这个资源,自本推文发布起限时3天,所有用户均可免费在线试看和下载。

使用地址:

https://app.svgzhenli.com/resource/ff4a1bfc-ee42-4608-95cd-740e0042e90f

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  1. CONNECT:[ UseTime:0.001187s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001821s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000827s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000697s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001445s ]
  6. SELECT * FROM `set` [ RunTime:0.000638s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001951s ]
  8. SELECT * FROM `article` WHERE `id` = 521013 LIMIT 1 [ RunTime:0.002674s ]
  9. UPDATE `article` SET `lasttime` = 1785048912 WHERE `id` = 521013 [ RunTime:0.017600s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000699s ]
  11. SELECT * FROM `article` WHERE `id` < 521013 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001283s ]
  12. SELECT * FROM `article` WHERE `id` > 521013 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001035s ]
  13. SELECT * FROM `article` WHERE `id` < 521013 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001880s ]
  14. SELECT * FROM `article` WHERE `id` < 521013 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002880s ]
  15. SELECT * FROM `article` WHERE `id` < 521013 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.012508s ]
0.222682s