Two free ribonucleotide units are interlinked with a

Peptide bond

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Covalent bond

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Hydrogen bond

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Phosphodiester bond

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Solution

The correct option is D Phosphodiester bond
The nucleotides form the structural backbone of the DNA. The two nucleotide units are held together by phosphodiester bonds. The phosphodiester bonds are formed by linkage of 3' carbon atom of one sugar molecule and the 5' carbon atom of another, deoxyribose in DNA and ribose in RNA.
So, the correct answer is option D.

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