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Nucleic acids are composed of nucleotides, each containing:

ASugar + phosphate + nitrogenous base
BJust phosphate
CSugar + base
DAmino acid
Answer & Solution
Correct answer: A. Sugar + phosphate + nitrogenous base
Nucleotide = pentose sugar (ribose/deoxyribose) + nitrogenous base (A, T/U, G, C) + phosphate group. Polymer of nucleotides → DNA or RNA via phosphodiester linkages.
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