DNA

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Across
  1. 3. section of DNA which codes for a characteristic
  2. 4. a base which pairs with cytosine
  3. 5. a base which pairs with thymine
Down
  1. 1. a base which pairs with adenine
  2. 2. DNA shape is this type of helix
  3. 3. the entire genes of an organism
  4. 6. deoxyribonucleic acid