| Term | Definition |
| Bacteriophanges | Viruses that reproduce by infecting other cells. They consist of an outer protein coat around a DNA core. Used by Hershey and Chase in their experiment to prove that DNA carries genetic information, not proteins. |
| Adenine | DNA/RNA base. Paired with Thymine and Uracil |
| Thymine | DNA base. Paired with Adenine. |
| Guanine | DNA/RNA base. Paired with Cytosine |
| Cytosine | DNA/RNA base. Paired with Guanine |
| Deoxyribose | DNA sugar |
| Ribose | RNA sugar |
| Uracil | RNA base. Paired with Adenine |
| Nucleotide | A single molecule of DNA/RNA. Consists of a base, a sugar, and a phosphate |
| Codon | A set of three nucleotides representing an amino acid |
| UCG/CCG/UUA/AGC | Switch AGC/GGC/AAT/TCG from DNA to messenger RNA |
| TCT/GGA/TTT/CGA | Switch UCU/GGA/UUU/CGA from transfer RNA to DNA |