O-LevelBiologyCell Biology5090/12 · May/June 2017 · Q21 Mark
Which statements about diffusion are correct? 1 Molecules move at random. 2 Molecules move down a concentration gradient. 3 Molecules may move through a partially permeable membrane.
A1, 2 and 3
B1 and 2 only
C1 and 3 only
D2 and 3 only
✓ Correct answer
A: 1, 2 and 3
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