【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。
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