複選題19. Which of the following statements regarding "Biomembrane" are CORRECT? (A) The two leaflets of a biomembrane may contain different phospholipids (B) Phospholipids are the major biomolecule responsible for selective uptake of materials across plasma membrane (C) Phospholipids with short or unsaturated fatty acyl chains decrease membrane fluidity (D) The major ATP-powered pump responsible for maintaining ion gradients across the plasma membrane of mammalian cells is the plasma-membrane Na+/K+ ATPase (E) In cell membrane, carbohydrates in glycoproteins or glycolipids are oriented towards inside