Here's why:
* Nucleic acids are long chains of repeating units called nucleotides.
* Nucleotides are the building blocks of nucleic acids. They consist of three parts:
* A nitrogenous base: Adenine (A), Guanine (G), Cytosine (C), Thymine (T), or Uracil (U)
* A five-carbon sugar: Ribose (in RNA) or Deoxyribose (in DNA)
* A phosphate group: PO43-
Therefore, a single nucleotide is the most basic unit of a nucleic acid and can be considered its simplest form.
