The basic unit of a nucleic acid is .......

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(A) Nucleic acids ($DNA$ and $RNA$) are polymers of nucleotides.Each nucleotide consists of three components: a nitrogenous base,a pentose sugar (ribo

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Nucleotide

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(A) Nucleic acids ($DNA$ and $RNA$) are polymers of nucleotides.Each nucleotide consists of three components: a nitrogenous base,a pentose sugar (ribose or deoxyribose),and a phosphate group.$A$ nucleoside consists only of a nitrogenous base and a pentose sugar,lacking the phosphate group.Therefore,the fundamental repeating unit that polymerizes to form nucleic acids is the nucleotide.

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