A level- Membranes

3. Describes the structure of cell membranes.
5. Movement of molecules from high to low concentration with the help of proteins.
7. Protein that forms a pore in the cell membrane for ions to pass through.
9. Protein attached to the surface of the cell membrane.
12. Molecule that stabilizes the fluidity of cell membranes.
13. Protein that spans across the cell membrane.
15. A solution with higher water potential than the cell.
16. A molecule that forms the bilayer of cell membranes.
18. Movement of molecules from low to high concentration using energy.
19. Protein that transports substances across the cell membrane.
20. Movement of water across a partially permeable membrane.
21. Protein with carbohydrate chains attached, involved in cell recognition.

1. Part of a phospholipid that repels water.
2. A channel protein that facilitates the transport of water across cell membranes.
4. Flattened membrane-bound compartments in the Golgi apparatus.
6. Movement of molecules from high to low concentration without energy.
8. The pressure created by water molecules, measured in kPa.
10. Lipid with carbohydrate chains attached, involved in cell recognition.
11. The jelly-like substance where organelles are suspended.
13. A solution with the same water potential as the cell.
14. The state of being swollen or firm due to high water content in plant cells.
15. Part of a phospholipid that is attracted to water.
17. A solution with lower water potential than the cell.