Across
- 2. Jelly-like substance where most metabolic reactions occur
- 7. A protein in the red blood cell which can combine with oxygen
- 8. Specialised dead plant cells that can transport water and mineral salts upwords
- 9. Organelle containing chlorophyll where photosynthesis takes place
- 11. Cell specialised to conduct electrical impulses in the nervous system
- 12. Site of aerobic respiration, releasing energy for the cell
- 15. Ratio of image size to actual size, calculated as image size divided by actual size
- 17. Single-celled microorganism with circular DNA and no nucleus
- 18. The underground plant organ system
- 19. Rigid outer layer that provides structural support in plant and bacterial cells
- 20. Group of similar cells working together to perform a specific function
Down
- 1. Small circular DNA molecule in bacteria that can be transferred between cells
- 3. A living individual made up of organ systems
- 4. Organelle containing genetic material and controlling cellular activities
- 5. Process by which cells become specialised for specific functions
- 6. Selectively permeable barrier controlling movement of substances into and out of the cell
- 10. Structure composed of different tissues working together for a particular function
- 13. Main genetic material
- 14. Site of protein synthesis
- 16. Fluid-filled sac in plant cells that stores water and maintains turgor pressure