当前位置:首页职业资格教师招聘中学教师招聘->下列选项中,能体现细胞的结构与功能相适应的是( )。

下列选项中,能体现细胞的结构与功能相适应的是( )。

  • A.动物卵细胞一般比较大,有利于储存营养供胚胎发育
  • B.变形虫的伸缩泡能增加膜表面积与体积的比,提高物质交换效率
  • C.草履虫出现两个细胞核保证了正常的核质比,有利于生命活动正常进行
  • D.控制细胞器进行物质合成的基因,主要是通过核孔从细胞核到达细胞质的
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答案: A、B、C
本题解析:

卵细胞和精子经过受精作用形成的受精卵,细胞核中的遗传物质一半来源于父方,一半来源于母方,而细胞质几乎来源于母方,为早期胚胎发育提供营养,A正确。变形虫的伸缩泡是一种膜结构,可以扩大膜面积,从而使膜面积与体积之比大大增加,提高了细胞与外界进行物质交换的效率,B正确。核质比是指一个细胞的核与细胞质在量(容积或体积)上的比例,一般来说,细胞核不会随细胞的体积增大而增大,因此,细胞体积增大,细胞核的“负担”就会相应增大,有些生物会通过增多细胞核的数目来维持正常的核质比,从而使生命活动正常进行,C正确。核孔是RNA和蛋白质等大分子物质进出细胞核的通道,而DNA不能从核孔中出来,D错误。

更新时间:2021-10-17 20:34

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