Final answer:
Nucleic acids, composed of nucleotides, are essential macromolecules in cells, forming DNA for genetic information and RNA for protein synthesis.
Step-by-step explanation:
Nucleic acids are vital biological macromolecules that are essential for various cellular activities such as cell division, protein synthesis, and heredity. Each nucleotide within a nucleic acid is composed of three parts: a pentose sugar, a nitrogenous base, and a phosphate group. The two primary types of nucleic acids are DNA (deoxyribonucleic acid) and RNA (ribonucleic acid), with DNA storing genetic information of the cell and RNA being involved in protein synthesis.