Write a short yet comprehensive note on nucleic acid

Nucleic acids are essential macromolecules found in all living organisms. They are polymers made up of repeating monomer units called nucleotides. Each nucleotide consists of three components: a phosphate group, a five-carbon sugar (either deoxyribose in DNA or ribose in RNA), and a nitrogenous base. The nitrogenous bases are adenine (A), guanine (G), cytosine (C), and thymine (T) in DNA, and A, G, C, and uracil (U) in RNA.

The primary function of nucleic acids is to store and transmit genetic information. Deoxyribonucleic acid (DNA) typically exists as a double helix, with two strands wound around each other, and carries the genetic blueprint for an organism. Ribonucleic acid (RNA) is usually single-stranded and plays various roles in protein synthesis, gene regulation, and as genetic material in some viruses. The sequence of nitrogenous bases along the nucleic acid chain encodes the genetic instructions.