DNA Crossword

1234567891011
Across
  1. 2. forms side piece of 'ladder'
  2. 5. shape that is a twisted 'ladder'
  3. 7. base starting with G
  4. 9. shaped in a double helix
  5. 10. base starting with C
  6. 11. forms 'rungs' of ladder
Down
  1. 1. makes up tissue
  2. 3. base starting with A
  3. 4. study of genes
  4. 6. cells make up all these
  5. 8. base starting with T