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    【题目】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，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】

    （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，还有少量糖类。

    （2）功能越复杂的细胞膜，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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