nucleoid

Examples of nucleoid in the following topics:

• Binary Fission

  • The single, circular DNA chromosome of bacteria is not enclosed in a nucleus, but instead occupies a specific location, the nucleoid, within the cell.
  • Although the DNA of the nucleoid is associated with proteins that aid in packaging the molecule into a compact size, there are no histone proteins and thus, no nucleosomes in prokaryotes.
  • The formation of a ring composed of repeating units of a protein, FtsZ, directs the partition between the nucleoids.
  • A septum is formed between the nucleoids, extending gradually from the periphery toward the center of the cell.

• Characteristics of Eukaryotic DNA

  • In contrast, prokaryotic DNA is not contained within a nucleus, but rather is attached to the plasma membrane and contained in the form of a nucleoid, an irregularly-shaped region that is not surrounded by a nuclear membrane .
  • Eukaryotic DNA is stored in a nucleus, whereas prokaryotic DNA is in the cytoplasm in the form of a nucleoid.

• DNA Packaging

  • A eukaryote contains a well-defined nucleus, whereas in prokaryotes the chromosome lies in the cytoplasm in an area called the nucleoid.
  • A eukaryote contains a well-defined nucleus, whereas in prokaryotes, the chromosome lies in the cytoplasm in an area called the nucleoid.

• Characteristics of Prokaryotic Cells

  • Prokaryotic DNA is found in a central part of the cell: the nucleoid .
  • This figure shows the generalized structure of a prokaryotic cell.All prokaryotes have chromosomal DNA localized in a nucleoid, ribosomes, a cell membrane, and a cell wall.The other structures shown are present in some, but not all, bacteria.

• Genomic DNA and Chromosomes

  • The region in the cell containing this genetic material is called a nucleoid.
  • Prokaryotes, including bacteria and archaea, have a single, circular chromosome located in a central region called the nucleoid.

• Transcription in Prokaryotes

  • The central region of the cell in which prokaryotic DNA resides is called the nucleoid region.

• Basic Structures of Prokaryotic Cells

  • Therefore, they do not have a nucleus, but, instead, generally have a single chromosome: a piece of circular, double-stranded DNA located in an area of the cell called the nucleoid.