A-Level Biology AQA Notes
3.1.5.1 Structure of DNA and RNA
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DNA & RNA
- DNA & RNA are both polynucleotides.
- The basic structure of a nucleotide is:
DNA | RNA | |
Number of Strands | Two antiparallel strands | One strand |
Length | Very long | Relatively short |
Pentose Sugar | Deoxyribose | Ribose |
Nitrogenous Bases | Adenine, Cytosine, Guanine & Thymine | Adenine, Cytosine, Guanine & Uracil |
Function | Store genetic information | Transfer genetic information & forms ribosomes with proteins |
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