Question

Which of the following is a unit nucleic acid?

• A. Nucleotide
• B. Nucleoside
• C. Nucleic acid
• D. All of the above

Answer 1

Answer: (A)

Nucleotide

The unit of nucleic acid is nucleotide. Nucleotides are organic molecules that serve as the monomers, or subunits, of nucleic acids like DNA and RNA. The building blocks of nucleic acids, nucleotides are composed of a nitrogenous base, a five-carbon sugar - ribose or deoxyribose, and at least one phosphate group. Thus, a nucleoside plus a phosphate group yields a nucleotide.

So, the correct answer is option A.