DNA :)

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Across
  1. 4. responsible for storing genetic information (thread like structure)
Down
  1. 1. base can differ according to protein, usually labelled as a letter (A,T,C,G)
  2. 2. a complete set of genetic information
  3. 3. specific part of DNA, with a particular protein produced
  4. 5. similar to DNA but made up of a single thread like structure