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Across 5. causes a cell to shrink because of osmosis 9. does not require energy from the cell 12. passive transport using carrier proteins 15. movement of a substance against the substance's concentration gradient 16. diffusion of water through a selectively permeable membrane 17. concentration of a substance is equal throughout a space

Down 1. movement of a substance by a vesicle to the inside of a cell 2. carrier protein used in active transport 3. movement of a substance by a vesicle to the outside of a cell 4. difference in the concentration of a substance across a space 6. causes a cell to swell because of osmosis 7. produces no change in cell volume because of osmosis 8. protein used to transport specific substances 10. acts as a signal molecule in the cytoplasm 11. binds to a signal molecule, enabling the cell to respond to the signal molecule 13. transport protein through which ions can pass 14. a movement of a substance down the substance's concentration gradient