Nucleotide: The basic structural unit of DNA and RNA, consisting of a sugar, a phosphate group, and a nitrogenous base.
DNA (Deoxyribonucleic Acid): A molecule that carries the genetic instructions used in growth, development, functioning, and reproduction of all known living organisms.
RNA (Ribonucleic Acid): A nucleic acid present in all living cells that acts as a messenger carrying instructions from DNA for controlling the synthesis of proteins