The unit of nucleic acid is

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(A) The correct answer is $A$. Nucleic acids ($DNA$ and $RNA$) are polymers of nucleotides. $A$ nucleotide consists of three components: a nitrogenous

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Nucleotide

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(A) The correct answer is $A$. Nucleic acids ($DNA$ and $RNA$) are polymers of nucleotides. $A$ nucleotide consists of three components: a nitrogenous base (purine or pyrimidine),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 repeating structural unit of a nucleic acid is a nucleotide.

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