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卵细胞和助细胞均有极性,大液泡和核分别位于细胞两端( )。

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  • 【名词&注释】

    普通话(putonghua)、贴近生活(close to life)、卵细胞(egg cell)、次生分生组织(secondary meristem)、侧生分生组织(lateral meristem)、维管形成层(vascular cambium)、助细胞(synergid)

  • [单选题]卵细胞和助细胞(synergid)均有极性,大液泡和核分别位于细胞两端( )。

  • A. 卵细胞和助细胞(synergid)的核均位于近珠孔的一边
    B. 卵细胞和助细胞(synergid)的核均位于近合点的一边
    C. 卵细胞的核位于近珠孔的一边,助细胞(synergid)的核近合点
    D. 助细胞(synergid)的核位于近珠孔的一边,卵细胞的核近合点

  • 查看答案&解析 点击获取本科目所有试题
  • 举一反三:
  • [单选题]Drunk driving,which was once a occurrence,is now rnder control.
  • A. general
    B. frepuent
    C. normal
    D. particular

  • [多选题]维管形成层(vascular cambium)属于( )。
  • A. 原分生组织
    B. 初生分生组织
    C. 侧生分生组织
    D. 次生分生组织

  • [单选题]Young hoatzins are different from their parents in that .
  • A. they look like young cuckoos
    B. they have claws on the wings
    C. they eat a lot like a cow
    D. they live on river banks

  • [单选题]Which of the following would be the best title for the passage?
  • A. Women Are Socially Trained to Talk B. Talking Maintains Relationships
    B. Women Love to Talk D. Men Talk Differently from Women

  • [单选题]In the writer’s opinion, his neighbor was _____________.
  • A. friendly
    B. warm-hearted
    C. not considerate
    D. not helpful

  • [单选题]
  • A. rag
    B. hat
    C. pocket
    D. counter

  • [单选题]紫萁(Osmunda japonica)的叶为同型叶。( )
  • A. 正确
    B. 错误

  • [单选题]下列词语中加点的字,读音全都正确的一组是
  • A. 祥瑞xiáng 馥郁fù 窈窕yǎo 蟾宫折桂chán
    B. 聪颖yǐng 仰慕mò 芳馨 xīn 龙驹凤雏chú
    C. 幽婉wǎn 荣膺yīng 醇美shún 岁稔年丰rěn
    D. 涟漪yī 富庶shù 澄澈chéng 万壑争流huò

  • [单选题]
  • A. hit
    B. disappointed
    C. presented
    D. bored

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