Genetics

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Across
  1. 4. molecular bases
  2. 5. a random change in a cell's DNA
  3. 7. the addition of a molecular base
  4. 8. the removal of a molecular base
Down
  1. 1. nucleotide that pairs up with cytosine
  2. 2. tightly coiled DNA
  3. 3. the exchange of one base for another
  4. 6. nucleotide that pairs up with adenine