1. how is facilitated diffusion different from other forms of passive transport? a. in facilitated diffusion, a special protein channel substances cross the cell membrane. b. facilitated diffusion is not a form of passive transport. c. facilitated diffusion requires atp. d. in facilitated diffusion, water flows through protein channels until it reaches a greater concentration inside the cell. 2. which of the following happens to a cell in a hypotonic solution? a. the cell stays the same. b. the cell loses water and shrivels. c. water moves into the cell. d. the cell gains water and expands. 3. what is the role of atp in the process of active transport? a. it provides the energy that cells need to move molecules against a concentration gradient. b. it lengthens the fatty acid chains in the cell membrane. c. it weakens the cell membrane, allowing molecules to pass through more easily. d. it provides the energy to transport the cell in its environment. 4. what kind of environment is described when the concentration of dissolved substances is greater outside the cell than inside? a. hypertonic b. hypotonic c. isotonic d. saline 5. an amoeba expels large particles by what process? a. diffusion b. endocytosis c. exocytosis d. osmosis