下面是“观察DNA和RNA在细胞中分布”的实验有关描述，正确的是（）

题干

A：实验原理是利用甲基绿和吡罗红两种染色剂对DNA和RNA的亲和力不同

B：甲基绿使RNA呈现绿色，吡罗红使DNA呈现红色

C：实验时先加甲基绿，水浴充分染色后再加吡罗红水浴染色

D：该实验结论：DNA分布在细胞核中，RNA分布在细胞质中

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