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Two free ribonucleotide units are interlinked with

1. peptide bond
2. covalent bond
3. hydrogen bond
4. phosphodiester bond

Correct answer: phosphodiester bond

Solution

Ribonucleotides are linked in nucleic acids by phosphodiester bonds, which connect the 3' hydroxyl of one sugar to the 5' phosphate of another. Peptide bonds join amino acids, while hydrogen bonds are not the backbone linkage.

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