Multiple Choice
The difference between simple and facilitated diffusion is that facilitated diffusion:
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11. Biological Membranes and Transport
Passive Membrane Transport
Multiple Choice
The rate of movement (flux) of a substance X into cells was measured at different concentrations of X to construct the following graph. Does the graph's data suggest diffusion of X into cells is mediated by a protein transporter?
A
Yes, diffusion of X is mediated by a protein transporter (facilitated diffusion).
B
No, diffusion of X is not mediated by a protein transporter (simple diffusion).
Verified step by step guidance1
Examine the graph provided, which plots the flux of substance X against its concentration [X].
Identify the relationship between flux and concentration. In this graph, the relationship appears to be linear, as indicated by the straight line.
Understand that a linear relationship between flux and concentration suggests that the rate of movement of X is directly proportional to its concentration.
Recall that simple diffusion is characterized by a linear relationship between flux and concentration, as it depends solely on the concentration gradient.
Conclude that since the graph shows a linear relationship, the diffusion of X is likely not mediated by a protein transporter, which would typically show a hyperbolic curve due to saturation kinetics, indicative of facilitated diffusion.
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