Here's a breakdown:

* Nucleic acids are complex biomolecules essential for all known forms of life. The two main types are DNA (deoxyribonucleic acid) and RNA (ribonucleic acid).

* Nucleotides are the building blocks of nucleic acids. Each nucleotide consists of three parts:

* A nitrogenous base: This is a ring-shaped molecule with nitrogen atoms. There are five main nitrogenous bases: adenine (A), guanine (G), cytosine (C), thymine (T), and uracil (U).

* A five-carbon sugar: This is either deoxyribose (in DNA) or ribose (in RNA).

* A phosphate group: This is a negatively charged group composed of phosphorus and oxygen atoms.

Nucleotides are linked together by phosphodiester bonds to form long chains called polynucleotides. The sequence of nucleotides in a polynucleotide carries the genetic information of an organism.