| 1. | Thymine | 2. | Thymosine |
| 3. | Thymidylic acid | 4. | Cytidylic acid |

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| 1. | |
2. | |
| 3. | 4. |

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| 1. | A heterocyclic compound |
| 2. | A monosaccharide |
| 3. | A phosphate |
| 4. | A saturated fatty acid |

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| 1. | Thymine | 2. | Uracil |
| 3. | Adenine | 4. | Guanine |

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