Which of the following is the simplest unit of a nucleic acid

The simplest unit of a nucleic acids is known as nucleotides.

A nucleotide consist of three distinct chemical groups

- a 5-carbon sugar (ribose and deoxyribose)

-a nitrogen-rich base (cytosine (C), guanine (G), adenine (A), thymine (T) in DNA or uracil (U) instead of T (in RNA)

-phosphate

Its nucleotides ... its contains sugar (deoxyribose in DNA and ribose in RNA) phosphate and a nitrogen base (A, C, G, T)