29、水溶性染色剂（PI）能与核酸结合而使细胞核着色，可应用于细

29、水溶性染色剂（PI）能与核酸结合而使细胞核着色，可应用于细胞死活的鉴别。细胞浸泡于一定浓度的PI中，仅有死亡细胞的核会被着色。利用PI鉴别细胞的基本原理是（）

A、死细胞与活细胞的核酸结构不同 B、死细胞与活细胞的核酸含量不同

C、活细胞能分解染色剂PI D、活细胞的细胞膜能阻止PI的进入

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