230问答网 > 生物里什么叫顺浓度梯度

生物里什么叫顺浓度梯度

2025-03-17 17:44:58
推荐回答（2个）
回答1：

一定需要的。只要是主动运输，可以是顺浓度梯度，也可以是逆浓度梯度，此时影响物质运输的不再是浓度梯度这个作用，而是载体与能量。也就是说只要是主动运输都需消耗能量，和浓度梯度无关。物质跨膜运输方式中的主动运输，顺浓度梯度运输时需要消耗能量吗？ 答：主动运输中，不管是顺浓度梯度，还是逆浓度梯度，都要需要消耗能量。协助扩散：facilitated diffusion.一些比较大的分子很难跨膜,以及一些极性的分子,还有离子（因为构成细胞膜的磷脂的脂肪酸尾巴不喜欢他们）很难跨膜 .所以,细胞膜上面会有一些蛋白质通道,容许特定很难扩散通过的分子/离子跨过去.比如葡萄糖太大的,就有一个专门的蛋白石隧道,只允许葡萄糖通过的.因为也是高浓度到低浓度,所以也是顺着浓度梯度

回答2：

物质从浓度高的一侧运输到到浓度低一侧

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