複選題36. Regarding to ion channels and membrane potential which statement is (are) CORRECT? (A) Most biomolecules cannot diffuse across pure phospholipid bilayer; however, cellular membranes facilitate the traffic of molecules and ions into and out of cells and their organelles through transport proteins. (B) Three classes of transmembrane proteins mediate transport of ions, sugars, amino acids, and other metabolites across membranes: channels, transporters, and ATP-powered pumps. (C) An inside-negative electric potential of about 60 mV exits across the plasma membrane of all cells. (D) In plants and fungi, the membrane potential is maintained by the ATP-driven pumping of protons from the cytosol to the exterior of the cell. (E) The resting membrane potential in animal cells is the results of the combined action of the ATP-powered Ca2+ pump and Na+ channel.