What two factors limit the rate of facilitated diffusion across a plasma membrane?
A) the size of the substance and the charge of the substance
B) the size of the substance relative to the size of the carrier protein
C) the charge of the substance relative to the resting membrane potential of the cell
D) the concentration gradient of the substance and the number of carrier proteins
E) the temperature of the interstitial fluid and the pH of the interstitial fluid
Answer: D
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