This is the repeating structural unit that forms rna and dna.

The correct answer will be option-nucleotides.

Explanation:

The nucleic acids-DNA and RNA are one of the biomolecules made up of small structural units called monomers.

The structural unit of nucleic acid is made up of "nucleotides" which is composed of a 5 carbon sugar, a phosphate group and a nitrogenous base. Each nucleotide is joined to another nucleotide via a phosphodiester bond between 5' phosphate group of one nucleotide to 3'-OH group of another nucleotide.

Thus, a nucleotide is the correct answer.

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