Why did the DNA cross the road? To get to the other strand!

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Across
  1. 2. best friend to thymine
  2. 7. cloning
  3. 11. how DNA changes
  4. 12. sexual reproduction
  5. 13. attraction between two atoms that already participate in other chemical bonds
  6. 16. phosphorus atom bound to four oxygen atoms
  7. 17. made up of many smaller subunits
  8. 18. presented in nearly all living organisms
Down
  1. 1. 5-carbon sugar biological molecule
  2. 3. parallel helices intertwined
  3. 4. best friend to cytosine
  4. 5. backbone of biology for life on Earth
  5. 6. asexual reproduction
  6. 8. threadlike structure of nucleic acids
  7. 9. best friend to guanine
  8. 10. c12h22o11
  9. 14. atomic number 7
  10. 15. best friend to adenine