DNA

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Across
  1. 4. DNA name
  2. 6. Rungs of the ladder (inside)
  3. 8. Number of human chromosomes
  4. 11. Pairs with thymine
  5. 13. Number of letters in the DNA code
  6. 16. T is for _________
  7. 18. ________and Crick
  8. 19. Coiled up DNA
  9. 20. Coiled up chromatin
  10. 21. Four letters used in DNA code
  11. 22. C is for ________
  12. 23. Single ring nitrogen base (T and C)
Down
  1. 1. only rule for DNA code
  2. 2. Pairs with cytosine
  3. 3. Shape of DNA
  4. 5. Sugar in DNA
  5. 7. Bond that connects nitrogen bases
  6. 9. Makes up rails of the ladder (outside)
  7. 10. Did not win the Nobel Prize
  8. 12. Nitrogen base + phosphate + sugar
  9. 14. Two ring nitrogen bases (A and G)
  10. 15. _______manual for DNA
  11. 17. Location of DNA