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  1. Given below is the diag rammatic 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 : Component → Cholesterol - Guanine
    2. Category : Component → Amino acid - NH2
    3. Category : Component → Nucleotide - Adenine
    4. Category : Component → Nucleoside - Uracil
Correct Option: D

A combination of a nitrogen base with a pentose sugar is known as nucleoside. The nitrogen base combines with the sugar molecule at its 1′ carbon atom in a glycosidic bond (C – N – C) by one of its nitrogen atoms (usually 1 in pyrimidines and 9 in purines). Depending upon the type of pentose sugar, nucleosides are differentiated into ribonucleosides and deoxyribonucleosides.


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