| Question | Answer |
| NUCLEOTIDE | Basic structural unit of nucleic acids and are made up of a phosphate group, pentose sugar and an organic base containing nitrogen, combined by a condensation reaction |
| POLYNUCLEOTIDE | Polymer of many nucleotide units |
| PYRIMIDINE BASES | Single ring structures e.g. Thymine, Cytosine, Uracil |
| PURINE BASES | Double ring structures e.g. Adenine, Guanine |
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