一学生在用洋葱鳞片叶表皮做质壁分离实验时,发现只有一个细胞未

一学生在用洋葱鳞片叶表皮做质壁分离实验时,发现只有一个细胞未发生质壁分离现象,这最可能是

  A.发育过程中的细胞         B.死细胞

  C.蔗糖溶液浓度太低         D.实验操作不正确

答案

B

相关题目

The new-designed car is on show now. I wonder ______. A. how much it cost   
The new-designed car is on show now. I wonder ______. A. how much it cost     B. how much it costs C. how much did it cost D. how much does it cost
Buck lived in Mr. Miller’s big house in the sunny Santa Clara valley. There w
Buck lived in Mr. Miller’s big house in the sunny Santa Clara valley. There were large gardens and fields of fruit trees around the house, and a river nearby. In a big place like this, of course,
面粉加工厂的车间里若悬浮着较多的面粉粉尘,遇明火就有
面粉加工厂的车间里若悬浮着较多的面粉粉尘,遇明火就有发生爆炸的危险。下面是模拟粉尘爆炸的一个实验。如下图,在小塑料筒里放入干燥面粉,
20世纪50年代,科学技术突飞猛进,对资源的开发利用也达到
20世纪50年代,科学技术突飞猛进,对资源的开发利用也达到了一个新的阶段,但对自然资源的无节制利用和保护自然资源,已成为当今世界的重大课题
下图中①②③三条线分别代表南半球冬半年某日①②③三地
下图中①②③三条线分别代表南半球冬半年某日①②③三地的太阳高度变化过程(h为一已知量)。读图回答问题。 (1)①②③三地的纬度依次为________、____
Tom’s father had not spoken to him since his marriage, because he considered T
Tom’s father had not spoken to him since his marriage, because he considered Tom ______ a mistake in marrying so young a girl. A. had made       B. made        C. would make      
用X+Y=M+N表示某些化学反应。请按要求写出相应的化学反
用X+Y=M+N表示某些化学反应。请按要求写出相应的化学反应方程式各一个。 (1)若X是金属、Y是常见的酸:                           
设NA为阿伏加德罗常数,下列说法中正确的是( ) A.1NA个
设NA为阿伏加德罗常数,下列说法中正确的是( ) A.1NA个氢气分子所占的体积为22.4LB.2NA个二氧化碳分子的质量为44gC.1000mL0.1mol/L的NaCl溶液中,Na+与

最新题目