问答题

Transport by carrier proteins can be either active or passive, whereas transport by channel proteins is always passive. Explain your answer.

【参考答案】

载体蛋白运输物质时必须与被运输的物质结合, 如果是顺势则是被动运输, 如果是逆势则需要耗能, 自然是主动运输。如同一叶小......

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