The diagram shows a cell surface membrane of a metabolically active cell and the direction in which some molecules move through the membrane. Which row indicates a process that the molecules may be using to cross the membrane at each of the points 1, 2, 3 and 4?
- A1 carbon dioxide by diffusion; 2 water by osmosis; 3 glucose by diffusion; 4 sodium ions by active transport
- B1 fatty acids by diffusion; 2 oxygen by diffusion; 3 carbon dioxide by diffusion; 4 water by osmosis
- C1 sodium ions by active transport; 2 carbon dioxide by diffusion; 3 water by osmosis; 4 glucose by facilitated diffusion
- D1 water by osmosis; 2 oxygen by diffusion; 3 fatty acids by diffusion; 4 glucose by active transport