nucleoid

Examples of nucleoid in the following topics:

• Bacterial Chromosomes in the Nucleoid

  • The nucleoid is an irregularly-shaped region within the cell of a prokaryote that contains all or most of the genetic material.
  • The nucleoid can also be seen under a light microscope.by staining it with the Feulgen stain, which specifically stains DNA.
  • The DNA-intercalating stains DAPI and ethidium bromide are widely used for fluorescence microscopy of nucleoids.
  • Proteins helping to maintain the supercoiled structure of the nucleic acid are known as nucleoid proteins or nucleoid-associated proteins, and are distinct from histones of eukaryotic nuclei.
  • Prokaryote cell (right) showing the nucleoid in comparison to a eukaryotic cell (left) showing the nucleus.

• 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.

• Complex and Asymmetrical Virus Particles

  • The viral genome is associated with proteins within a central disk structure known as a nucleoid.
  • The nucleoid is surrounded by a membrane and two lateral bodies of unknown function.

• Chemical Analysis of Microbial Cytoplasm

  • Macromolecules found within bacterial cytoplasm include the nucleoid region, ribosomes, proteins, and enzymes.
  • The nucleoid region is the area within the cell that houses the genetic material.

• 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.

• The Cell Wall of Bacteria

  • The term "nucleoid" refers to the region of the cytoplasm where chromosomal DNA is located, usually a singular, circular chromosome.

• Verrucomicrobia

  • Like the Planctomycetes species, Verrucomicrobia possess a compartmentalised cell plan with a condensed nucleoid and the ribosomes pirellulosome (enclosed by the intracytoplasmic membrane) and paryphoplasm compartment between the intracytoplasmic membrane and cytoplasmic membrane.

• Planctomycetes

  • In addition to this nucleoid, there are two other membrane-separated compartments; the pirellulosome or riboplasm, which contains the ribosome and related proteins, and the ribosome-free paryphoplasm.

• 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.