| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| nitrogenous bases purines and pyrimidines | 1.81 | 0.5 | 7350 | 23 | 41 |
| nitrogenous | 0.78 | 0.2 | 5041 | 65 | 11 |
| bases | 1.32 | 0.2 | 1561 | 3 | 5 |
| purines | 1.31 | 0.5 | 7409 | 54 | 7 |
| and | 1.37 | 0.4 | 2585 | 33 | 3 |
| pyrimidines | 1.31 | 0.4 | 686 | 82 | 11 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| nitrogenous bases purines and pyrimidines | 1.33 | 0.9 | 9460 | 21 |
| purines and pyrimidines bases | 0.5 | 0.7 | 5863 | 65 |
| purine bases and pyrimidine bases | 1.29 | 0.5 | 7917 | 41 |
| which bases are purines and pyrimidines | 0.57 | 1 | 5911 | 74 |
| pyrimidine and purine bases | 1.32 | 0.6 | 7474 | 33 |
| which nitrogen bases and pyrimidines | 0.8 | 0.5 | 1451 | 63 |
| which of the nitrogenous bases are purines | 0.4 | 0.2 | 5918 | 60 |
| nitrogenous bases are pyrimidines | 0.27 | 0.8 | 7168 | 83 |
| purine and pyrimidine bases a level | 1.52 | 0.8 | 9100 | 86 |
| pyrimidine bases vs purine | 1.95 | 0.1 | 9899 | 44 |
