| Term | Definition |
| Nucleotide | Molecules which comprise the structure of DNA and RNA.Compose of a phosphate group, pentose, and base containing nitrogen |
| Phosphodiester Bonds | A bond formed between adjacent nucleotides which consists of a phosphate group that links the sugars of two nucleotides |
| Pyrimidines | Nitrogenous base with a six-membered ring of carbon and nitrogen atoms.CTU |
| Purines | Larger nitrogenuous bases with a six-membered ring fused to a five-membered ring |
| RNA | nucleic acid made of ribose. N=CGAU. Usually single stranded |
| DNA | nucleic acid made of deoxyribose. N=CGAT, usually double stranded |
| Ribose | The sugar component of RNA nucleotides |
| Deoxyribose | The sugar component of DNA nucleotides, having one less hydroxyl group than ribose |
| Double Helix | The form of native DNA, referring to its two adjacent antiparellel polynucleotide strands wound around an imaginary axis into a spiral shape |