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inysia [295]
3 years ago
13

When does the cell have to use active transport ?

Biology
1 answer:
soldier1979 [14.2K]3 years ago
8 0
The cell has to use active transport when it's trying to transport material against the concentration gradient. (from low to high concentration) Or, if a molecule is too big to diffuse through the cell membrane, it must be moved through using a carrier protein.
Hope that helped you.
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