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Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by -
A
Base-sugar-OH
B
Base-sugar-phosphate
C
Sugar-phosphate
D
(Base-sugar-phosphate)n
Detailed Solution
A nucleotide has three components: a nitrogenous base, a pentose sugar and a phosphate group.
The nitrogenous base is linked to the 1' carbon of the pentose sugar by an N-glycosidic bond to form a nucleoside.
A phosphate group is linked to the 5'-OH of the sugar of the nucleoside by a phosphoester bond to form a nucleotide.
So a nucleotide = base + sugar + phosphate.
Base + sugar alone is a nucleoside, sugar + phosphate lacks the base, and (base-sugar-phosphate)n represents a polynucleotide (nucleic acid), not a single nucleotide.
So each nucleotide is formed by base-sugar-phosphate.
The nitrogenous base is linked to the 1' carbon of the pentose sugar by an N-glycosidic bond to form a nucleoside.
A phosphate group is linked to the 5'-OH of the sugar of the nucleoside by a phosphoester bond to form a nucleotide.
So a nucleotide = base + sugar + phosphate.
Base + sugar alone is a nucleoside, sugar + phosphate lacks the base, and (base-sugar-phosphate)n represents a polynucleotide (nucleic acid), not a single nucleotide.
So each nucleotide is formed by base-sugar-phosphate.