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Across 5. Process of diffusion in which molecules pass across the membrane through the cell membrane channels. 6. Organism whose cell contain a nucleus. 7. Organelle found in cells of plants and some other organisms that captures the energy from sunlight and converts it into chemical energy. 8. Filiments that provide shape and structure for the cell. 12. Unicellular organism that lacks a nucleus. 13. Taking in by a matter by a living cell by invagnitation of its membrane to form a vacuole. 14. Flexible double-layered sheet that makes up cell membrane. 15. When comparing two solutions, the solution with the greater concentration of solutes. 16. Center of an atom, which contains the protons and neutrons. 18. Constant internal physical and chemical conditions that organisms maintain. 20. Stores, modifies and packages proteins for EXPORT from the cell. 21. When the concentration of two solutions is the same. 22. Strong, supporting layer around the cell membrane in some cells. 23. Hates water; repels water. 24. Garbage disposal of the cell.

Down 1. Property of biological membranes that allows some substances to pass across it while others cannot. 2. "Powerhouse" of the cell; cellular respiration occurs here. 3. Internal membrane system found in eukaryotic cells: place where lipid components of the cell membrane are assembled. 4. When cell vacuoles are released to the exterior through fusion of the vacuole membrane with cell membrane. 7. Basic unit of all forms of life. 9. Structure in an animal cell that helps to organize cell division. 10. Process from which particles tend to move from an area where they are more concentrated to an area where they are less concentrated. 11. Diffusion of water through a selectively permeable membrane. 15. Loves water; attracted to water. 17. The site of protein synthesis. 18. When comparing two solutions, the solution with the lesser concentration of solutes. 19. Specialized structure that performs important cellular functions within a cell.