A-LEVEL BIOLOGY AQA NOTES
structure of dna and rna
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 |