Nucleoid region. Definition. noun. The area within a prokaryotic cell where the genetic material is to be found. Supplement. Prokaryotes are characterized by their lack of a ââtrueââ nucleus.In stead of a nucleus, they have a nucleoid where their genetic material is localized. See also: prokaryote.he area within a prokaryotic cell where the genetic material is to be found. Supplement. Prokaryotes are characterized by their lack of a ââtrueââ nucleus. In stead of a nucleus, they have a nucleoid where their genetic material is localized.
Nucleic acids are the molecules that carry the genetic information that is passed down from parent to child. However, nucleic acids are special since they can also combine with proteins to become the machines -- called ribosomes -- that turn genetic instructions in nucleic acids into other protein machines. Nucleic acids are linked together into a chain. DNA is made of two chains that connect like a rope ladder.
In retrospect, the first clue about how nucleic acids function was obtained by Erwin Chargaff, who found that DNA always contains the same amounts of certain pairs of bases. There is always just as much adenine as thymine, for example, and just as much guanine as cytosine.