In Biomolecules (Class 11 Biology / Chemistry), understanding how DNA and RNA are built is essential. The structural 'glue' that holds our genetic code together is the Phosphodiester Bond.
Function: It connects nucleotides together to build DNA and RNA polymers.
Location: It forms the 'Sugar-Phosphate Backbone' of the DNA double helix.
Chemical Link: Connects the 3' carbon of one sugar to the 5' carbon of the next via a phosphate group.
A Phosphodiester Bond (or linkage) is a strong covalent chemical bond that links nucleotides together to form the long chains of DNA and RNA.
In chemical terms: It forms when exactly two hydroxyl (OH) groups in phosphoric acid react with hydroxyl groups on two other molecules (the sugars) to form two ester bonds. Specifically, it links the 3' (three-prime) carbon atom of one sugar molecule to the 5' (five-prime) carbon atom of another sugar molecule.
A phosphodiester bond is a strong covalent bond that links the phosphate group of one nucleotide to the sugar of another nucleotide. It is responsible for forming the sturdy sugar-phosphate backbone of DNA and RNA.
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