biology unit

4. idea that all living things are composed of cells
5. Threadlike structures made of DNA molecules that contain the genes.
6. basic unit of life
7. made of one cell
8. makes protein
12. An organelle found in large numbers in most cells,
13. cells without a nucleus
15. a living thing
16. brain of the cell
17. Wall A rigid layer of nonliving material that surrounds the cells of plants and some other organisms.
19. DNA segments that serve as the key functional units in hereditary transmission.
20. made up multiple cells

1. A tiny cell structure that carries out a specific function within the cell
2. Membrane A cell structure that controls which substances can enter or leave the cell.
3. organisms that get their food from other organisms.
4. a jelly like fluid
9. cells with a nucleus
10. organisms that make their own food.
11. stores water salts and proteins
14. An organelle where photosynthesis occurs, found in plant cells.
18. Membrane A cell structure that controls which substances can enter or leave the cell.