Biology Crossword

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Across
  1. 4. noncoding regions
  2. 8. catalytic RNA molecules that function as enzymes and can splice RNA
  3. 9. pattern of DNA made by two strands
  4. 10. special nucleotide sequences at the end of eukaryotic chromosomal DNA, postpone erosion of genes
  5. 12. regulatory “switch”
  6. 14. enzymes that untwist the double helix at the replication forks
  7. 15. inactivates the repressor to turn the lac operon on
Down
  1. 1. mRNA base triplets
  2. 2. can start an RNA chain from scratch and adds RNA nucleotides one at a time using the parental DNA as a template
  3. 3. giant protein complexes that bind protein molecules and degrade them
  4. 5. consist of a variety of proteins and several small nuclear nuclear ribonucleoproteins (snRNPs) that recognize the splice sites
  5. 6. a complex of DNA and protein found in the nucleus
  6. 7. sites of translation
  7. 11. promoter that is crucial in forming the initiation complex in eukaryotes
  8. 13. DNA is added here continuously, one complimentary base at a time