下列因素中哪个不是诱变剂? A  γ射线    B  紫外线    C  吖啶

下列因素中哪个不是诱变剂?

A  γ射线    B  紫外线    C  吖啶类染料    D  乙酸

答案

D


解析:

γ射线是能量极高的电离辐射,它可通过直接或间接的方式诱发突变。紫外线也可诱发突变。紫外线的最有效波长为270nm,它相当于核酸的吸收峰,因此可以引起DNA碱基对的突变和染色体的断裂。吖啶类染料能和DNA结合而起到显示作用,但它能造成碱基对的增加或缺失,从而可以诱发移码突变。乙酸参加正常代谢,不是诱变剂。

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