There is a high concentration of molecule X outside the cell which enters the cell by facilitated diffusion. The results of measuring the concentration of X inside the cell at 30 s intervals are shown by the graph.
Why does the concentration of X inside the cell remain constant after 150 s?
1) There is no more of X outside the cell.
2) The number of carrier proteins is limiting.
3) There is no net movement of X.
1 )
1 and 2 only
2 )
1 and 3 only
3 )
2 and 3 only
3 only
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