| A | B |
| mutagen | examples: ultraviolet light and X-rays |
| thymine | a pryimidine in DNA that pairs only with adenine |
| anticodon | sequence of three bases on transfer RNA |
| adenine | a purine in DNA that pairs only with thymine |
| cytosine | a pyrimidine in DNA that pairs only with guanine |
| transformation | transfer of genetic material from a dead bacterium to a live one |
| guanine | a purine in DNA that pairs only with cytosine |
| genetic code | the correspondance between nucleotides in DNA and the amino acids in proteins |
| replication | process of making copies of DNA |
| nucleotide | subunit of a DNA molecule made from a base of sugar and a phosphate group |
| uracil | a pyrimidine in RNA that pairs only with adenine |
| transcription | process of making messenger RNA |
| double helix | the structure of a DNA molecule |
| translation | process of converting the genetic code in RNA into the amino acid sequence that makes up a protein |
| ribosome | a structure in the cytoplasm where proteins are synthesized |