三影响主动运输的因素:1、载体:是细胞膜上的一类蛋白质。1载体具有特异性,不同物质的载体不同,不同生物细胞膜上载体的种类和数目也不同 Template




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tomski三影响主动运输的因素:1、载体:是细胞膜上的一类蛋白质。1载体具有特异性,不同物质的载体不同,不同生物细胞膜上载体的种类和数目也不同 coloring