| appear purple | 0.68 |
| developed resistance | 0.52 |
| lack outer membrane | 0.40 |
| retain the crystal viol… | 0.25 |
| cause diphtheria | 0.23 |
| cause tetanus | 0.16 |
| thick cell wall | 0.42 |
| thick peptidoglycan lay… | 0.32 |
| gram-negative bacteria | 0.25 |
| more sensitive | 0.25 |
| isolated | 0.45 |