推荐回答(5个)
我来回答~
这个实验中加入盐酸有三个作用
1.改变细胞膜通透性
2.加速染料进入细胞
3促使DNA与蛋白质分离 更有利于染色
第二个疑问也好办
你记住了 除了病毒以外
所有的生物都有DNA和RNA
病毒的遗传物质只有一种 只有DNA 或者只有RNA
你记住厉害的病毒都是RNA的就行
因为RNA单链不稳定容易变异
1.
是的,应该是促使DNA与蛋白质分离,更利于染色
还有一个,可以改变细胞膜的通透性,使燃料更容易进入细胞
2.
这里的核酸指的是两者之一,或者两者都有
像病毒,就只有一种核酸,DNA或者RNA
而有细胞结构的生物都同时含有DNA和RNA
有些生物是没有脱氧核糖核酸的,所以核酸应该是其中的一种,有的两种都有,有的只有RNA
更利于染色
还有一个,使燃料更容易进入细胞
2.
是的1,或者两者都有
像病毒,应该是促使DNA与蛋白质分离.
这里的核酸指的是两者之一,就只有一种核酸,可以改变细胞膜的通透性
固定细胞标本
便于定位观察,否则标本会移动脱落的
不冲洗的话,残留的盐酸会影响碱性染料的着色效果。
吡罗红甲基绿染色剂是混合染色剂,吡罗红和甲基绿两种染色剂对rna和dna的亲和力不同,甲基绿使dna呈现绿色,吡罗红使rna呈现红色.
因为细胞核中主要含有dna,而细胞质中主要分布rna,所以显示不同的颜色。
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