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【医学ppt课件】DNA是遗传物质

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医学ppt课件 遗传物质PPT课件 遗传物质ppt 【医学课件】DNA DNA是遗传物质 遗传物质课件
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Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. DNA是遗传物质 第六章第一节 授课教师:王小云 2010年12月20日 Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. 新课导入 请问:同学们在哪些地方还见到这些条形码? 它们有什么作用? Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. 商品条形码中包括商品的名称、价格、生 产日期、产地等信息,相当于商品的“户口”或“ 身份证”。 Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. 蛋白质 DNA 复习 旧知 这两种物质中,究竟哪种是遗传 物质呢? 回顾知识:染色体的主要组成成分是什么? Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. (一)、肺炎双球菌的转化实验 Ⅰ. 1928年,格里菲思用两种不同类型 的 肺炎双球菌 去感染小鼠。 • 菌落光滑(Smooth) • 有多糖荚膜 • 有毒性 多糖荚荚膜 S S型细菌 S • 菌落粗糙(Rough) • 无多糖荚膜 • 无毒性 R R R型细菌 Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. (一)、肺炎双球菌的转化实验 Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. 实验结论 活R + 有毒S型死细菌 小鼠死亡 有毒S型死细菌 小鼠正常 有毒S型活细菌 小鼠死亡 无毒R型活细菌 小鼠正常 (一)、肺炎双球菌的转化实验 第一组组 第三组 Text in here第二组 第四组 S型细菌中有一种“转化因子”能使R型活 细菌转化为S型活细菌。 Ⅰ、1928年,格里菲斯 S型活细菌 Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. 寻觅“转化因子”? S型细菌的化学组分图 多糖 蛋白质…… DNA 多糖 蛋白质 …… DNA Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. 实验结论 多 糖 蛋白质质 DNA “转化因子”是S 型细菌的DNA, DNA是遗传物质。 R 型细菌 R 型细菌 (一)、肺炎双球菌的转化实验 ——寻觅“转化因子”实验设计 Ⅱ.1944年,埃弗里 S型活细菌 + + + R 型细菌 R 型细菌 R 型细菌 S 型细菌 R 型细菌 Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. 噬菌体的结构模式图 Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. (二) 、噬菌体侵染细菌实验 当噬菌体侵染大肠杆菌时,能在大肠杆菌体内 繁殖出几百个性状完全相同的噬菌体后代 Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. 研究方法 (二) 、噬菌体侵染细菌实验 同位素标记法 蛋白质的组成元素: DNA 的组成元素: C、H、O、N C、H、O、N ((标记标记 35 35 S S )) (标记(标记 32 32 P P )) S P Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. 1. 用 放射性同位素35S 标记噬菌体 蛋白质外壳 子代噬菌体 (二) 、噬菌体侵染细菌实验 35 S 噬菌体侵染细细菌时时,蛋白质质外壳留在外面 ,没有进进入到细细菌中。 实验表明 子代 无35S 亲代噬菌体 想一想:这一结果说明了什么? 大肠杆菌体内 无35S Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. 2. 用 放射性同位素32P 标记噬菌体内部 DNA 32P 子代噬菌体 实验表明 噬菌体侵染细细菌时时,DNA 进进入到细细菌中。 (二) 、噬菌体侵染细菌实验 亲代噬菌体 子代有 32P 想一想:这一结果又说明了什么? 大肠杆菌体 内有 32P Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. 亲代亲代 噬菌体噬菌体 35 35 S S标记 标记 蛋白质蛋白质 32 32 P P标记 标记 DNADNA 寄主寄主 细胞内细胞内 无 有 子代子代 噬菌体噬菌体 无 有 DNA 进入 到细菌中 蛋白质外壳 没有进入 到细菌中。 表明 Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. 噬菌体侵染细菌的动态过程: 吸附 注入复制 合成 组装 释放 侵入别的细菌 Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. 巩固: 在噬菌体侵染实验中,只有噬菌体 注入到 细菌体 ,而噬菌体 外壳则留在细菌 之 。侵染到细菌体内的噬菌体,以自己的 DNA为模板,以 为原料, 复制出许多 。在这些DNA的指 导下以 为原料合成噬菌体的 。 蛋白质 DNA 细菌的脱氧核苷酸 内蛋白质 外 细菌的氨基酸 噬菌体的DNA Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. DNA是唯一的遗传物质吗? DNADNA是噬菌体的遗传物质,是噬菌体的遗传物质,DNADNA具具 有有连续性。连续性。 噬菌体侵染细菌实验的结论:噬菌体侵染细菌实验的结论: Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. RNA(核糖核酸) 有些病毒(如艾滋病病毒,非典病毒,禽 流感病毒,烟草花叶病毒等),它们不含有 DNA, 只含有RNA。 在这种情况下,( )就 起着遗传物质的作用。 例:病毒的遗传物质是( ) 人体的主要遗传物质是( ) A、DNA C、DNA和RNA B、RNA D、DNA或RNA D A RNA Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. 核酸是生物的遗传物质,核酸核酸是生物的遗传物质,核酸 包括脱氧核糖核酸(包括脱氧核糖核酸(DNADNA)和核糖核)和核糖核 酸(酸(RNARNA),绝大多数生物都是以),绝大多数生物都是以 DNADNA作为遗传物质的,因此作为遗传物质的,因此DNADNA是主是主 要的遗传物质。要的遗传物质。 课堂 小结 Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. 思考: 通过这节课的学习通过这节课的学习, ,你能总结出作你能总结出作 为遗传物质应具备什么样的特点为遗传物质应具备什么样的特点? ? ①①能自我复制,保持连续性能自我复制,保持连续性. . ②②能指导蛋白质合成能指导蛋白质合成. . ③③结构相对稳定结构相对稳定. . ④④能储存大量的遗传信息,能储存大量的遗传信息, 能产生可遗传的变异。能产生可遗传的变异。 Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. 1.1.肺炎双球菌转化实验中肺炎双球菌转化实验中, ,发现无毒发现无毒R R型和被加型和被加 热杀死的有毒热杀死的有毒S S型细菌混合后型细菌混合后, ,在小鼠体内找到在小鼠体内找到 了下列类型的了下列类型的 细菌细菌 A A、无毒、无毒R R型,有毒型,有毒S S型型 B B、有毒、有毒R R型,无毒型,无毒S S型型 C C、有毒、有毒R R型,有毒型,有毒S S型型 D D、无毒、无毒R R型,无毒型,无毒S S型型 练习题 2.格里菲思提出的“转化因子”,后来被埃弗里证实了 它的化学成分,它是: A、脂质 B、蛋白质 C、多糖 D、DNA Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. 3、 T2 噬菌体的结构组成为 : A、蛋白质、脂类 B、糖类、蛋白质 C、蛋白质、DNA D、蛋白质、RNA 4、“DNA是主要的遗传物质”是指: A、遗传物质的主要载体是染色体 B、大多数生物的遗传物质是DNA C、细胞里的DNA大部分在染色体上 D、染色体在遗传上起主要作用 Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. 5、噬菌体侵染细菌的正确顺序是 : A、注入---吸附---释放---组装---复制 B、复制---组装---释放---吸附---注入 C、吸附---注入---复制---组装---释放 D、吸附---注入---组装---复制---释放 6.下列能通过噬菌体侵染细菌实验过程不能证实的是 A、DNA能产生可遗传的变异 B、DNA是遗传物质 C、DNA能自我复制 D、DNA能控制蛋白质合成 Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. 7.分析噬菌体侵染细细菌的示意图图回答下列问题问题 : (1)图图C表明噬菌体侵染细细菌时时,留在细细菌体外的物 质质是 ,注入细细菌体内的物质质是 。 (2)合成D、E、F中子代噬菌体的蛋白质质外壳的原料 是由 提供的,其合成场场所是 。 (3)图中的噬菌体在 形态、大小等方面 都完全相同。这说 明噬菌体的性状是 由 传给后代的 ,也证明 是遗 传物质。 蛋白质DNA 细菌 细菌的核糖体 DNA DNA Through this publicity campaign, further improve the sense of business integrity of tourism enterprises to help tourism consumers and operators to safeguard the legitimate rights and interests, to ensure that our City's tourism sustainable, healthy and coordinated Development. 生物组 王小云 2010/12/20
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