Cells and cell division

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Across
  1. 3. to make an exact copy
  2. 5. respiration happens here
  3. 8. red blood cells do not have one of these
  4. 10. when a cell divides to produce two identical copies they are called this
  5. 11. how many times bigger?
  6. 13. are made of DNA
  7. 14. happens in the chloroplasts
  8. 15. a sperm cell has one of these
  9. 16. white blood cells produce these
  10. 18. we use this to look at very small things
  11. 19. these cells contract
Down
  1. 1. cells without a nucleus
  2. 2. a web of fibres in cell division
  3. 4. plant cells have these in the centre
  4. 5. the layer on the outside of all cells
  5. 6. cell division of eukaryotic cells
  6. 7. a small ring of DNA found in bacteria
  7. 9. the cytoplasm divides and new cell membranes form
  8. 12. protein synthesis happens here
  9. 16. these cells do not have a cell wall
  10. 17. these reproduce by binary fission