题目内容

【题目】（7分）根据所学知识，请回答下列问题：

（1）细胞膜主要由________________________组成，还有少量的________________________。

（2）功能越复杂的细胞膜，其上的蛋白质的________________________越多。

（3）植物传粉后，同种和不同种花粉都会落在雌蕊柱头上，同种花粉粒能萌发，不同种花粉粒一般不能萌发，这与细胞间相互识别有关，细胞识别体现了细胞膜的________________________功能。

（4）植物细胞在细胞膜外面还有一层________________________，它的主要化学成分是________________________，对植物细胞有________________________作用。

【答案】（每空1分，共7分）

（1）脂质和蛋白质 糖类

（2）种类和数量

（3）信息交流

（4）细胞壁 纤维素和果胶 支持和保护

【解析】（1）细胞膜主要由脂质和蛋白质组成，还有少量的糖类。（2）功能越复杂的细胞膜，其上的蛋白质的种类和数量越多。（3）植物传粉后，同种和不同种花粉都会落在雌蕊柱头上，同种花粉粒能萌发，不同种花粉粒一般不能萌发，这与细胞间的相互识别有关，细胞识别体现了细胞膜进行细胞间的信息交流的功能。（4）植物细胞在细胞膜外面还有一层细胞壁，它的主要化学成分是纤维素和果胶，对植物细胞有支持和保护作用。

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