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  2. Prokaryote - Wikipedia

    en.wikipedia.org/wiki/Prokaryote

    Both eukaryotes and prokaryotes contain large RNA/protein structures called ribosomes, which produce protein, but the ribosomes of prokaryotes are smaller than those of eukaryotes. Mitochondria and chloroplasts , two organelles found in many eukaryotic cells, contain ribosomes similar in size and makeup to those found in prokaryotes. [ 48 ]

  3. Cell (biology) - Wikipedia

    en.wikipedia.org/wiki/Cell_(biology)

    Structure of a typical prokaryotic cell. Prokaryotes include bacteria and archaea, two of the three domains of life. Prokaryotic cells were the first form of life on Earth, characterized by having vital biological processes including cell signaling. They are simpler and smaller than eukaryotic cells, and lack a nucleus, and other membrane-bound ...

  4. Cell biology - Wikipedia

    en.wikipedia.org/wiki/Cell_biology

    Cell biology (also cellular biology or cytology) is a branch of biology that studies the structure, function, and behavior of cells. [1] [2] All living organisms are made of cells. A cell is the basic unit of life that is responsible for the living and functioning of organisms. [3] Cell biology is the study of the structural and functional ...

  5. Prokaryotic cytoskeleton - Wikipedia

    en.wikipedia.org/wiki/Prokaryotic_cytoskeleton

    The prokaryotic cytoskeleton is the collective name for all structural filaments in prokaryotes. It was once thought that prokaryotic cells did not possess cytoskeletons, but advances in visualization technology and structure determination led to the discovery of filaments in these cells in the early 1990s. [2]

  6. Archaea - Wikipedia

    en.wikipedia.org/wiki/Archaea

    For much of the 20th century, prokaryotes were regarded as a single group of organisms and classified based on their biochemistry, morphology and metabolism. Microbiologists tried to classify microorganisms based on the structures of their cell walls, their shapes, and the substances they consume. [11]

  7. Organelle - Wikipedia

    en.wikipedia.org/wiki/Organelle

    In the Planctomycetota species Gemmata obscuriglobus, a nucleus-like structure surrounded by lipid membranes has been reported. [27] [29] Compartmentalization is a feature of prokaryotic photosynthetic structures. [2] Purple bacteria have "chromatophores", which are reaction centers found in invaginations of the cell membrane. [2]

  8. Nucleoid - Wikipedia

    en.wikipedia.org/wiki/Nucleoid

    The nucleoid (meaning nucleus-like) is an irregularly shaped region within the prokaryotic cell that contains all or most of the genetic material. [1] [2] [3] The chromosome of a typical prokaryote is circular, and its length is very large compared to the cell dimensions, so it needs to be compacted in order to fit.

  9. Chromatin - Wikipedia

    en.wikipedia.org/wiki/Chromatin

    Prokaryotic cells have entirely different structures for organizing their DNA (the prokaryotic chromosome equivalent is called a genophore and is localized within the nucleoid region). The overall structure of the chromatin network further depends on the stage of the cell cycle .

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