what molecule does dna belong to
The last class of organic molecules are the nucleic acids. There are two varieties: ribonucleic acid, or RNA, and deoxyribonucleic acid, or DNA. These polymers are long chains of components called bases, of which there are only five types. RNA is a single-strand molecule; DNA is a spiral of two cross-connected strands. DNA carries information. Part of the DNA in a cell is genes, which code for protein molecules. Each type of receptor, or enzyme, or neurotransmitter, has a stretch of DNA in which its sequence of amino acids is coded.