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Genetics - Section 1 :: Discussion
| 4. | Which characteristic is shared by purines and pyrimidines? | |
| A. | Both contain two heterocyclic rings with aromatic character. | |
| B. | Both can form multiple non-covalent hydrogen bonds. | |
| C. | Both exist in planar configurations with a hemiacetal linkage. | |
| D. | Both exist as neutral zwitterions under cellular conditions. | |
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