Given below is the diagrammatic representation of one of the categories of small molecular weight organic compounds in living tissues. Identify the category shown and the one blank component "X" in it.

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A combination of a nitrogen base with a pentose sugar is known as a nucleoside . The nitrogen base combines with the sugar molecule at its carbon atom 1' in a glycosidic bond (C - N - C) by one of its nitrogen atoms (usually 1 in pyrimidines and 9 purines). Depending upon the type of pentose sugar, nucleosides are differentiated into ribonucleosides and deoxyribonucleosides . As 2nd Carbon of the sugar has hydroxyl group, it is an RNA molecule, and hence component "X" is Uracil.

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