What is a mononucleotide?

A mononucleotide is a type of biological molecule. 

Mononucleotides are composed of 3 things : 
1) A pentose sugar (pentose meaning a sugar with 5 carbon atoms). 
2) A nitrogen-containing organic base (or a nitrogenous base). 
3) A phosphate group. 

Mononucleotides are monomers (smaller units) that make up DNA and RNA. 

Imagine single letters to a word or a sentence. 

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