科学工作者对存活不同天数的一叶片中的某种物质进行了测量，得到了下表数据
表中的某种物质不可能是下列中的（）。
- A.蛋白质
- B.叶肉细胞核DNA
- C.叶绿素
- D.自由水
正确答案及解析
正确答案
解析
蛋白质是生命活动的承担者，随着叶片天数增加，叶片面积增加，蛋白质先增加，后叶片衰老，则蛋白质减少，A正确；叶肉细胞核中的DNA，即遗传物质不会改变，B错误；叶片中的叶绿素先增加后减少，C正确；自由水越多，新陈代谢越旺盛，衰老时，自由水减少，D正确。
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