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  2. Last universal common ancestor - Wikipedia

    en.wikipedia.org/wiki/Last_universal_common_ancestor

    [a] [18] The DNA was kept double-stranded by an enzyme, DNA polymerase, which recognises the structure and directionality of DNA. [19] The integrity of the DNA was maintained by a group of repair enzymes including DNA topoisomerase. [20] If the genetic code was based on dual-stranded DNA, it was expressed by copying the information to single ...

  3. Amoeba - Wikipedia

    en.wikipedia.org/wiki/Amoeba

    Clockwise from top right: Amoeba proteus, Actinophrys sol, Acanthamoeba sp., Nuclearia thermophila., Euglypha acanthophora, neutrophil ingesting bacteria. An amoeba (/ ə ˈ m iː b ə /; less commonly spelled ameba or amœba; pl.: amoebas (less commonly, amebas) or amoebae (amebae) / ə ˈ m iː b i /), [1] often called an amoeboid, is a type of cell or unicellular organism with the ability ...

  4. File:DNA molecular structure, showing individual nucleotides ...

    en.wikipedia.org/wiki/File:DNA_molecular...

    You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.

  5. Molecular models of DNA - Wikipedia

    en.wikipedia.org/wiki/Molecular_models_of_DNA

    The chemical structure of DNA is insufficient to understand the complexity of the 3D structures of DNA. In contrast, animated molecular models allow one to visually explore the three-dimensional (3D) structure of DNA. The DNA model shown (far right) is a space-filling, or CPK, model of the DNA double helix. Animated molecular models, such as ...

  6. Photo 51 - Wikipedia

    en.wikipedia.org/wiki/Photo_51

    Photo 51 is an X-ray based fiber diffraction image of a paracrystalline gel composed of DNA fiber [1] taken by Raymond Gosling, [2] [3] a postgraduate student working under the supervision of Maurice Wilkins and Rosalind Franklin at King's College London, while working in Sir John Randall's group.

  7. Mimiviridae - Wikipedia

    en.wikipedia.org/wiki/Mimiviridae

    The first member of this family, Mimivirus, was discovered in 2003, [6] and the first complete genome sequence was published in 2004. [7] However, the mimivirus Cafeteria roenbergensis virus [8] was isolated and partially characterized in 1995, [9] although the host was misidentified at the time, and the virus was designated BV-PW1.

  8. Amoeba (genus) - Wikipedia

    en.wikipedia.org/wiki/Amoeba_(genus)

    Amoeba is a genus of single-celled amoeboids in the family Amoebidae. [2] The type species of the genus is Amoeba proteus , a common freshwater organism, widely studied in classrooms and laboratories.

  9. Symbiosis in Amoebozoa - Wikipedia

    en.wikipedia.org/wiki/Symbiosis_in_Amoebozoa

    Electron microscopy image of giant virus Mimivirus Giant viruses , or nucleocytoplasmic large DNA viruses , frequently infect Amoebozoa and other protists causing amoeba lysis and cell rounding in 12 hours and amoeba population collapse in 55 hours. [ 3 ]