xmas biology

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Across
  1. 5. a change in the DNA sequence
  2. 6. the physical expression of a genotype
  3. 10. a nitrogenous base found in RNA that replaces thymine and pairs with adenine
  4. 11. a sugar found in milk
  5. 12. an enzyme that breaks down lactose into simpler sugars
  6. 13. an allele that is expressed only when two copies are present
  7. 14. a nitrogenous base found in DNA and RNA that pairs with guanine
  8. 15. a nitrogenous base found in DNA that pairs with adenine
  9. 17. DNA sequences that provide instructions for making proteins
  10. 22. a nitrogenous base found in DNA and RNA that pairs with cytosine
  11. 24. DNA sequences that do not code for proteins but can regulate gene expression
  12. 25. a nitrogenous base found in DNA and RNA that pairs with thymine in DNA and uracil in RNA
  13. 27. process in which ribosomes read mRNA and build a protein
Down
  1. 1. process of copying a gene’s DNA sequence into mRNA
  2. 2. having two identical alleles for a gene
  3. 3. cell organelle that contains DNA and is where transcription occurs
  4. 4. cell structure where mRNA is translated into a protein
  5. 6. a molecule made of amino acids that performs most cell functions
  6. 7. a protein that speeds up chemical reactions in cells
  7. 8. different forms of the same gene
  8. 9. having two different alleles for a gene
  9. 14. a tightly coiled structure of DNA and proteins that carries genes
  10. 16. messenger RNA that carries a copy of genetic instructions from DNA to the ribosome
  11. 17. a three-nucleotide sequence on mRNA that codes for a specific amino acid
  12. 18. an allele that is expressed when at least one copy is present
  13. 19. two nitrogen bases held together by hydrogen bonds in DNA
  14. 20. a segment of DNA that codes for a protein or trait
  15. 21. the genetic makeup of an organism
  16. 23. genetic material that stores instructions for making proteins and determining traits
  17. 26. the twisted ladder shape of DNA