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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
A
Category: Nucleoside; Component: Uracil
B
Category: Cholesterol; Component: Guanine
C
Category: Amino acid; Component: $NH_2$
D
Category: Nucleotide; Component: Adenine
Detailed Solution
The figure shows a pentose sugar with –OH groups on both the 2' and 3' carbons, so it is ribose.
A sugar joined to a nitrogenous base without a phosphate group is a nucleoside; with a phosphate it would be a nucleotide.
Uracil is a base found with ribose, so the category is nucleoside and X is uracil.
A sugar joined to a nitrogenous base without a phosphate group is a nucleoside; with a phosphate it would be a nucleotide.
Uracil is a base found with ribose, so the category is nucleoside and X is uracil.