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

1. Category: Cholesterol, Component: Guanine
2. Category: Amino acid, Component: NH2
3. Category: Nucleotide, Component: Adenine
4. Category: Nucleoside, Component: Uracil

Correct answer: Category: Nucleotide, Component: Adenine

Solution

A nucleotide is the basic unit of nucleic acids and consists of a nitrogenous base, a pentose sugar, and a phosphate group. In the given diagram, the blank component X is the nitrogenous base adenine, so the category is nucleotide.

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