A polyneucleotide chain is made up of nucleotide monomer. The DNA double helix is an example of two polyneucleotide chains that are coiled together. Each monomer has three parts, a pentose sugar, a phosphate group and a nitrogenous base. The phosphate group and pentose sugar form a phosphodiester linkage which becomes the backbone of the nucleotide chain. There are four nitrogenous bases in DNA, adenine, guanine, thymine and cytosine. However, in RNAthymine is replaced with uracil .
- ↑ Professor John Blamire, 1999. The Giant Molceules of Life [online] Availbale at:http://www.brooklyn.cuny.edu/bc/ahp/SDPS/SD.PS.polynuc.html [Accessed 13/11/13]
- ↑ Pearson Education, Inc. Concept 2 Review: The Polynucleotide Chain [online] Available at:http://www.phschool.com/science/biology_place/biocoach/dnarep/polynuc.html [Accessed 13/11/13]