| A | B |
|---|
| Nitrogenous bases of DNA | adenine, cytosine, guanine, and thymine |
| The sugar in DNA | deoxyribose |
| The type of bond that connects two nitrogenous bases | hydrogen |
| The shape of DNA | double helix |
| Developers of the double helix model | Watson and Crick |
| X-ray crystallographer whose work was not credited until 1968 | Rosalind Franklin |
| DNA base pairings | A-T; C-G |
| Discovered that A=T and C=G | Chargaff |
| Ran the lab where Franklin worked; shared Nobel Prize with W & C | Wilkins |
| The idea that one side of DNA is "upside down" when compared to the other side | antiparallel construction |
| The end of the DNA molecule that begins with a sugar | Three prime |
| The end of the DNA molecule that begins with a phsophate | Five prime |
