4.1 Building blocks

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Across
  1. 3. Organelle where respiration releases energy
  2. 4. Movement of particles from high to low concentration
  3. 5. Amount of substance in a given volume
  4. 6. Structure that provides strength and support in plant cells
  5. 7. Cell division for growth and repair producing identical cells
  6. 9. Neutral particle found in the nucleus
  7. 10. Structure that controls entry and exit of substances in the cell
  8. 12. Central part of the atom containing protons and neutrons
  9. 13. State where particles are far apart and move freely
  10. 15. Site of photosynthesis in plant cells
  11. 18. How many times larger an image is than the real object
  12. 20. State where particles vibrate in fixed positions
  13. 21. Cell division that forms gametes with half the chromosome number
  14. 22. Sub‑atomic particle with a negative charge
Down
  1. 1. Change of state from solid to liquid
  2. 2. Positively charged particle in the nucleus
  3. 4. Mass per unit volume of a substance
  4. 5. Smallest unit of life
  5. 8. Atoms of the same element with different numbers of neutrons
  6. 9. Structure in the cell that contains genetic material
  7. 11. Change of state from liquid to gas at the surface
  8. 14. Diffusion of water through a partially permeable membrane
  9. 16. State where particles are close but can move past each other
  10. 17. Force caused by particles colliding with container walls
  11. 19. Smallest unit of an element