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Across 1. Situated inside the cell. 5. A protein which span the whole of the phospholipid bilayer. 7. Used to describe molecular arrangements within membranes. (2 Words) 9. A structure which is two layers thick, this consists of phosphates and lipids. 12. movement of substances across membranes against their concentration gradient. (2 Words) 13. Found in cell membranes and is a lipid molecule which maintains membrane stability. 15. It is made out of a phospholipid bilayer and controls what travels through the boundary. (2 Words) 16. Allows movement of some substances through the membrane. (2 Words) 18. Where phospholipids have carbohydrates attached to them. 19. A protein molecule that has carbohydrate molecules attached. 20. The movement of molecules from a higher concentration to a lower concentration.

Down 2. The difference in concentration of substance between two regions. (2 Words) 3. A foreign molecule, examples of this can be proteins or glycoproteins. 4. The intensity of heat in a cell. 6. Cells with a nucleus and nuclear-bound organelles. 8. The scientific term for water-loving. 10. A protein which carries molecules across the plasma membrane. (2 Words) 11. Occurring outside the cell. 14. The two fatty acid tails are water-hating. 17. This is produced in the mitochondira during respiration.