Exercise 3 Crossword (after slides 13 - 31)

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Across
  1. 1. Type of base — purines and pyrimidines are both ______ bases (8 letters)
  2. 4. RNA that carries the genetic code from nucleus to ribosome (abbreviation, 4 letters)
  3. 6. Deoxyribonucleic acid — molecule of heredity (3 letters)
  4. 7. Pyrimidine base found only in DNA, replaced by uracil in RNA (7 letters)
Down
  1. 2. Cellular organelle where translation takes place (8 letters)
  2. 3. Three-base sequence on mRNA that codes for one amino acid (5 letters)
  3. 5. Purine base that pairs with thymine in DNA (7 letters)
  4. 8. The 3D spiral structure of double-stranded DNA (5 letters)