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Membrane Exchange and Homeostasis
Grade Level
AP Biology
APB.150 Membrane Exchange and Homeostasis
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A model shows many arrows crossing a membrane in both directions, with thicker arrows for net movement of water into the cell. What explanation best interprets the model?
A
All water molecules move only into the cell because arrows in both directions represent solute movement.
B
Individual water molecules move both ways, but the net movement into the cell indicates the external solution is hypotonic relative to the cytoplasm.
C
The model shows active transport of water because net movement is never passive.
D
The cell is isotonic with its environment because arrows appear on both sides of the membrane.
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