紫色洋葱表皮细胞发生质壁分离后,在显微镜下观察到的正确图示是

紫色洋葱表皮细胞发生质壁分离后,在显微镜下观察到的正确图示是(    )

答案

D


解析:

考查质壁分离相关知识。洋葱表皮细胞的紫色是由位于液泡内的花菁素引起的,因此液泡内呈紫色,细胞质基质中呈无色;随着细胞失水,液泡内细胞液浓度增大,紫色变深。

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