The Rate of Facilitated Diffusion of a Molecule Across a Membrane

question 84

Multiple Choice

The rate of facilitated diffusion of a molecule across a membrane will increase as the concentration gradient of the molecule across the membrane increases to a certain point. Eventually, an increase in the concentration of the molecule will not cause any further increase in facilitated diffusion. This is because:

• A)facilitated diffusion requires ATP energy.
• B)as the concentration gradient increases, molecules interfere with one another.
• C)there are a limited number of carrier proteins in the membrane.
• D)the increased concentration gradient causes a situation far from equilibrium.
• E)the diffusion constant depends on the concentration gradient.

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