Bacteria have an undefined nuclear region which lacks a nuclear membrane and contains only DNA without proteins. Such a region is called:

The correct answer is Nucleoid.

Key Points

• In prokaryotic organisms, the nuclear region is not surrounded by any membrane.
  • The undefined nuclear region lacking a nuclear membrane and containing only DNA without proteins in bacteria is called the nucleoid.
• Prokaryotic cells are primitive organisms.
  • In prokaryotes, the nucleoid contains all or most of the genetic material.
  • In prokaryotic cells, the nucleus is not well-defined because it is not surrounded by the nuclear membrane.

Additional Information

• A nucleosome is a section of DNA wrapped around a core of protein.
  • Inside the nucleus, DNA forms a complex with a protein called chromatin, which allows the DNA to condense into small amounts.
• A nucleus, as it relates to genomics, is a membrane-bound organelle within a cell that contains chromosomes.
  • A series of pores, or pores, in the nuclear membrane allow selective passage of certain molecules (such as proteins and nucleic acids) in and out of the nucleus.
• Nucleoproteins are a type of proteins that are associated with nucleic acids and ribosomes and lipoproteins, they often serve as lipid transport and storage proteins such as vitelline.
  • A nucleoprotein is a conjugated protein structure consisting of a protein linked to a nucleic acid, either DNA abbreviated as deoxyribonucleic acid or RNA abbreviated as ribonucleic acid.