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Question

The three chemically distinct components in a nucleotide are

A
a heterocyclic compound, a disaccharide and a phosphate group
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B
a heterocyclic compound, a disaccharide and a hydroxyl group
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C
a heterocyclic compound, a monosaccharide and a phosphate group
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D
a heterocyclic compound, a monosaccharide and a hydroxyl group
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Solution

The correct option is C a heterocyclic compound, a monosaccharide and a phosphate group
The three chemically distinct components in a nucleotide are -
a heterocyclic compound, which is a nitrogenous base,
a monosaccharide, which is a pentose sugar, and
a phosphate group or phosphoric acid.

The heterocyclic compounds in a nucleotide are the nitrogenous bases named adenine, guanine, uracil, cytosine and thymine.
The pentose sugar is a five carbon monosaccharide. It may be a ribose sugar (in case of RNA) or a deoxyribose sugar (in case of DNA).



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