Given below is the diagrammatic representation of one of the categories of small moleuclar weight organic compounds in the living tissues. Identify the category shown and the one blank component 'X' in it.
A
Category-Nucleotide Component -Adenine
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B
Category -Nucleoside Component -Uracil
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C
Category-Cholesterol Component-Guanine
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D
Category -Amino acid Component-NH2
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Solution
The correct option is B Category -Nucleoside Component -Uracil A nucleoside consists of a nitrogenous base covalently attached to a sugar (ribose or deoxyribose), whereas a nucleotide consists of a nitrogenous base, a sugar (ribose or deoxyribose) and one to three phosphate groups.
In the given diagram, if X is uracil, a nitrogenous base, a nucleoside is obtained and hence is the correct option.