Which of the following conditions must be met if diffusion across a membrane is to occur?
A) A concentration gradient must be present, and the membrane can't be permeable to the substance being transported.
B) A concentration gradient must be present, and the membrane must be permeable to the substance that is to be transported.
C) The membrane must be permeable to the substance that is to be transported.
D) A concentration gradient must be present.
Correct Answer:
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