Which Statement About Aquaporins Is False

Which statement about aquaporins is false?

A) They transport water and hydronium ions efficiently.
B) They exclusively transport water molecules at a high rate.
C) They use hydrogen bonding to side chain NH₂ groups of two Asn residues to exclude proton transport within the pore.
D) They have a narrow constriction approximately equal to the van der Waals diameter of a water molecule.
E) They use Arg and His side chains to remove associated water molecules from the 'transported' H₂O.