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Structural components of DNA and RNA nucleotides, illustrating base pairing and sugar-phosphate backbone.

Diagram showing the structure of DNA nucleotides, including purine and pyrimidine bases, deoxyribose sugar, and phosphate groups, with uracil in RNA highlighted.

Diagram showing the structure of DNA nucleotides, including purine and pyrimidine bases, deoxyribose sugar, and phosphate groups, with uracil in RNA highlighted.

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