Which of the following is evidence for aquaporins?
A) Kidney cells are otherwise incapable of maintaining a gradient.
B) Kidney cell transport of water molecules can be inhibited by mercuric ions.
C) Water,a polar substance,cannot cross the hydrophobic membrane without mediation.
D) Rapid rates of water transport require mediation.
E) Studies measuring flux of water molecules in the kidney yielded only linear plots of flux vs.[H2O] despite the large excess in water.
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