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    【题目】马蛔虫受精卵与菠菜根尖分生区细胞的有丝分裂不同，其结构基础是因为菠菜根尖分生区细胞（ ）

    A．有叶绿体和细胞壁 B．有细胞壁和液泡

    C．有叶绿体和液泡 D．有细胞壁、无中心体

    【答案】D

    【解析】马蛔虫受精卵属于动物细胞，菠菜根尖分生区细胞属于植物细胞。动物细胞和植

    物细胞有丝分裂过程的区别是前期和末期；前期是纺锤体的形成方式不同，动物细胞由

    两个中心体分别移向两极，周围发出星射线，形成纺锤体；植物细胞由细胞两极发出纺锤

    丝形成纺锤体。末期形成子细胞的方式不同，动物细胞的细胞膜从细胞中部向内凹陷，

    最后把细胞缢裂为两部分，从而形成两个子细胞；植物细胞在赤道板的位置出现细胞板，

    细胞板从中央向四周扩展，逐渐形成新的细胞壁，并把一个细胞分为两个细胞。因此马

    蛔虫受精卵与菠菜根尖分生区细胞的有丝分裂不同，其结构基础是因为菠菜根尖分生区细

    胞有细胞壁、无中心体。

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