Word Count : 249

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Nucleosides and nucleotides are essential molecules of life, forming the structural framework of nucleic acids such as DNA and RNA. A nucleoside consists of two main components: a nitrogenous base and a pentose sugar. The nitrogenous bases are divided into purines _____ ________ _______ ______ _______ ________ _________ ___ ____ _______ ___.
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