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Across 3. RNA has this instead of Thymine 7. Heating to 95oC in PCR separates the strands breaking these (2 Words) 8. Histone allows DNA to do this (2 Words) 9. cells with no nucleus 10. DNA polymerase can only add nucleotides to this end of a forming strand (2 Words) 11. enzyme that can only extend an existing section of DNA (2 Words) 13. many proteins from a single gene (3 Words) 14. mRNA when it is ready to leave the nucleus (2 Words) 16. first stage of gene expression 17. small circles of DNA 18. Genes when expressed generate your 19. used to join amino acids (2 Words) 23. RNA molecules are always this (2 Words) 25. important triplet of bases on tRNA 29. coding sections 32. Synthesises the primary transcript (2 Words) 33. r in r RNA 34. joins fragments of DNA together 36. PCR does this to DNA 37. chromosomes in the nucleus 38. the entire amount of inherited DNA 39. second stage of gene exspression

Down 1. cells with a nucleus 2. PCR (3 Words) 4. Bacteria have a large circular one 5. sugar found in RNA 6. practical application of PCR (3 Words) 12. Influences how expressed genes may appear 15. the one that isn't continuously copied (2 Words) 20. G - C, A -T 21. exceptional eukaryote 22. Always at the 5' end 24. basic unit of nucleic acids 26. non-coding sections 27. removal of non-coding sections and the joining of coding sections (2 Words) 28. chromosomes in mitochondria and chloroplasts 30. other function of RNA polymerase ______________ the strands 31. codes for 1 amino acid 35. short sections of DNA that show polymerase where to start