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第一章 走近细胞. 第二节. 细胞的多样性和统一性. 结论: 细胞具有多样性. 思考 : 以上这些细胞的共同结构有哪些 ?. 思考 : 以上这些细胞的共同结构有哪些 ?. 细胞膜 细胞质 细胞核. 思考 ; 你能从中举出一两个例子 , 说说造成细胞不同的形态结构的原因吗 ?. 细胞所处的位置不同 , 功能不同 , 是细胞分化的结果 , 如红细胞 , 洋葱表皮细胞. 思考 : 是不是所有细胞都具有细胞膜、细胞质和细胞核这三个结构呢?. 有些生物的细胞具有这三个结构,有些细胞只具有细胞膜、细胞质,而没有成形的细胞核. 原核细胞生物:细菌、蓝藻、支原体、衣原体.

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第二节

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