The graph shows how the rate of entry of glucose into a cell changes as the concentration of glucose outside the cell changes.
What is the cause of the plateau at X?
1 All the carrier proteins are saturated with glucose.
2 The cell has used up its supply of ATP.
3 The concentrations of glucose inside and outside the cell are equal.
1 only
2 )
3 only
3 )
1 and 2 only
4 )
2 and 3 only
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