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15、E9wEwZ#QcUE%&qYpEh5pDx2zVkum&gTXRm6X4NGpP$vSTT#&ksv*3tnGK8!z89AmYWpazadNu#KN&MuWFA5uxGjqv$UE9wEwZ#QcUE%&qYpEh5pDx2zVkum&gTXRm6X4NGpP$vSTT#&ksv*3tnGK8!z89AmYWpazadNu#KN&MuWFA5uxY7JnD6YWRrWwcvR9CpbK!zn%Mz849GxGjqv$UE9wEwZ#QcUE%&qYpEh5pDx2zV蛋白质、氮肥蛋白质、氮肥学习目标：学习目标：1、掌握蛋白质的检验方法、重金属盐对人体的危害2、掌握生活中的氮肥 学习重点：学习重点：蛋白质的变性、生活中的氮肥如何检验 课前原知识考察：课前原知识考察：元素 符号 H Na K化合价符号+3 Al2S 2O离子 符号Mg2+Cl l离子结构 示意图原子结构 示意图一、蛋白质（大体讲讲蛋白质）一、蛋白质（大体讲讲蛋白质） 蛋白质是构成细胞的基本物质，是机体成长及修补受损组织的主要原料。 （1）蛋白质的多样性：蛋白质是有多种氨基酸构成的极其复杂的有机化合物，相对分子质 量很大，从几万到几百万。构成氨基酸的基本元素有氢、氧、碳、氮，但不同种类的蛋白 质可能含有其他元素，如血红蛋白中除碳、氢、氧、氮外还还有铁元素。 （2）蛋白质的存在：主要存
