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Across 3. A protein framework inside a cell that gives the cell a shape. 4. Structures that receives materials fromt he endoplasmic reticulum and sends them to other parts of the cell. 7. A small round cell structure containing chemicals that break down large food particles into smaller ones. 8. An organism composed of only one cell. 9. The organelle that directs the cell's the activities. 10. A sac inside a cell that acts as a storage area. 14. An organism composed of many cells. 15. A group of similar cells that work together to perform a specific function. 16. A structure in the cells of plants and some other organisms that captures energy from sunlight and uses it to produce food. 17. A widely accepted explanation of the relationship between cells and living things. 18. The outside cell boundary the controls which substances can enter or leave the cell. 19. A group of different tissues that work together to perform a specific function.

Down 1. The network of passageways that carries materials from one part of the cell to another. 2. Small structures that produce proteins. 5. The gel-like fluid found between the cell membrane and the nucleus. 6. A rigid layer of nonliving material that surrounds the cells of plants and some other organisms. 11. A group of organs that work together to perform a major function. 12. Most of the cell's energy is produced whithin these rod-shaped organelles. 13. A tiny structure within the cell that carries out a specific function. 17. The basic unit of structure and function in living things.