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The graph below shows the relationship between glucose concentration outside a cell and the rate of glucose diffusion across a cell membrane that has carrier proteins to facilitate diffusion.
-According to the graph, as the number of glucose molecules increases, the rate of diffusion
A) increases indefinitely.
B) decreases.
C) increases until a plateau is reached.
D) can either increase or decrease.
E) remains the same.

Question

Use the following to answer questions :
The graph below shows the relationship between glucose concentration outside a cell and the rate of glucose diffusion across a cell membrane that has carrier proteins to facilitate diffusion. 
-According to the graph, as the number of glucose molecules increases, the rate of diffusion
A) increases indefinitely. 
B) decreases. 
C) increases until a plateau is reached. 
D) can either increase or decrease. 
E) remains the same.

Quizplus · Accepted Answer

As the concentration of glucose outside the cell increases, the rate of diffusion initially increases as more carrier proteins bind to the glucose molecules. However, at a certain point, all of the carrier proteins become saturated with glucose and the rate of diffusion reaches a plateau, indicating that no more glucose can be transported into the cell.

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