[第五章第三节关注癌症.ppt

[例1]　 (2009·海南高考)下列关于癌细胞的叙述，错误的是 (　　) A．癌细胞具有无限增殖的能力 B．细胞癌变可以由病毒感染引发 C．原癌基因只存在于癌细胞中 D．癌细胞的转移与细胞间黏着性下降有关 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. [思路点拨] Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. [精讲精析]　细胞癌变是细胞中原癌基因和抑癌基因发生突变导致正常细胞的生长和分裂失控而造成的，在细胞中都存在原癌基因与抑癌基因。 [答案]　C Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 与基因的 关系 细胞膜的 变化 细胞分化 受基因 控制 正常 细胞凋亡 受基因 控制 内陷 细胞坏死 不受基 因控制 破裂 细胞癌变 受突变基 因控制 糖蛋白等 减少，黏着性降低 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 形态 变化 影响 因素 细胞分化 具有不同的形态和功能 基因有选 择地表达 细胞凋亡 细胞变圆，与周围细胞脱离 受严格的 遗传机制 决定的程 序性调控 细胞坏死 细胞外形不规则变化 电、热、冷、机械等因素影响 细胞癌变 呈球形 分为物理、化学和病毒致癌因子 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 对机体的 影响 细胞分化 对机体有 利，形成不同组织 细胞凋亡 对机体 有利 细胞坏死 对机体 有害 细胞癌变 对机体 有害 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client