nucleoid

(noun)

the irregularly-shaped region within a prokaryote cell where the genetic material is localized

Related Terms

  • eukaryotic
  • prokaryotic
  • genome
  • gene
  • chromosome
  • plasmid
  • osmotic pressure
  • locus

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.
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