The following list indicates certain molecules/ions and their mechanism of transport across the cell membrane. Determine the correct pair(s) from the list.
I. Diffusion - Na+
II. Active transport - Amino acids
III. Osmosis - Water
IV. Facilitated diffusion - Glucose
II and IV
II, III and IV only
I, II, III and IV
Osmosis is the movement of water molecules from high chemical potential to low chemical potential (water potential) along the concentration gradient, but Na+ moves actively. Amino acids and glucose move through facilitated diffusion.