Deoxyribonucleic acid <unk>  is a nucleic acid that contains the genetic instructions used in the development and functioning of all known living organisms and some viruses. The main role of<unk>  molecules is the long-term storage of information.<unk>  is often compared to a set of blueprints or a recipe, since it contains the instructions needed to construct other components of cells, such as proteins and RNA molecules. The<unk>  segments that carry this genetic information are called genes, but other<unk>  sequences have structural purposes, or are involved in regulating the use of this genetic information.
Chemically,<unk>  is a long polymer of simple units called nucleotides, with a backbone made of sugars and phosphate groups joined by ester bonds. Attached to each sugar is one of four types of molecules called bases. It is the sequence of these four bases along the backbone that encodes information. This information is read using the genetic code, which specifies the sequence of the amino acids within proteins. The code is read by copying stretches of<unk>  into the related nucleic acid RNA, in a process called transcription.
Within cells,<unk>  is organized into structures called chromosomes. These chromosomes are duplicated before cells divide, in a process called<unk>  replication. Eukaryotic organisms (animals, plants, and fungi) store their<unk>  inside the cell nucleus, while in prokaryotes (bacteria and archae) it is found in the cell's cytoplasm. Within the chromosomes, chromatin proteins such as histones compact and organize<unk> . These compact structures guide the interactions between<unk>  and other proteins, helping control which parts of the<unk>  are transcribed.
DNA
Nucleic acid
Vector 
Vector
Biomolecule
Glycolipid
Nutrient
Nucleoside