| A | B |
| Phosphate Group | Part of a nucleotide, makes up the backbone of DNA, phosphorus |
| Pentose Sugar | Part of a nucleotide, makes up the backbone of DNA, 5 |
| Nitrogenous Base | Part of a nucleotide, makes up the "rungs" of DNA |
| Complementary | This describes the way that bases fit together to form 3 rings on every rung |
| Base-Pair Rule | A-T G-C |
| Double Helix | Twisted ladder shape |
| Nucleic Acid | One of the four types of macromolecules, genetic information |
| Deoxyribose | the sugar found in DNA |
| Ribose | the sugar found in RNA |
| Chromosome | Condensed DNA, humans have 46 total |
| Protein | DNA directs the production of the this molecule |
| Gene | these code for specific proteins |
| Purine | bases made of 2 C/N rings |
| Pyrimidine | bases made of 1 C/N ring |
| Adenine | purine, complement to thymine |
| Guanine | purine, complement to cytosine |
| Cytosine | pyrimidine, complement to guanine |
| Thymine | pyrimidine, complement to adenine |