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?
All the carrier proteins are saturated with glucose.
2 )
The carrier proteins are denatured and no longer able to function.
3 )
The cell has used up its supply of ATP.
4 )
The concentrations of glucose inside and outside the cell are equal.
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