All of the following are true about a partition coefficient except
A) it is the ratio of solubility in an organic solvent to solubility in water.
B) it can be used to predict the probability that an amino acid is part of a transmembrane region of a protein.
C) it is high for a molecule that readily crosses membranes by simple diffusion.
D) it is the concentration at which the rate of transport is half maximal.
E) it depends on the polarity of the molecule.
Answer: D
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