Think about it, part 2

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Across
  1. 2. A=T, G=C
  2. 6. X-Ray
  3. 8. Purines pair with pyrimidines
  4. 10. Blender
Down
  1. 1. Doublehelix
  2. 3. pneumonia vaccine
  3. 4. Monomer
  4. 5. Virus
  5. 7. Ladder
  6. 9. Transforming principle