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  2. Nucleosome - Wikipedia

    en.wikipedia.org/wiki/Nucleosome

    Nucleosome core particles are observed when chromatin in interphase is treated to cause the chromatin to unfold partially. The resulting image, via an electron microscope, is "beads on a string". The string is the DNA, while each bead in the nucleosome is a core particle. The nucleosome core particle is composed of DNA and histone proteins. [29]

  3. Histone octamer - Wikipedia

    en.wikipedia.org/wiki/Histone_octamer

    The nucleosome assembles when DNA wraps around the histone octamer, two H2A-H2B dimers bound to an H3-H4 tetramer. The nucleosome core particle is the most basic form of DNA compaction in eukaryotes. Nucleosomes consist of a histone octamer surrounded by 146 base pairs of DNA wrapped in a superhelical manner. [10]

  4. Eukaryotic chromosome structure - Wikipedia

    en.wikipedia.org/wiki/Eukaryotic_chromosome...

    The nucleosome is the basic unit of DNA condensation and consists of a DNA double helix bound to an octamer of core histones (2 dimers of H2A and H2B, and an H3/H4 tetramer). About 147 base pairs of DNA coil around 1 octamer, and ~20 base pairs are sequestered by the addition of the linker histone (H1), and various length of "linker" DNA (~0 ...

  5. Nucleoprotein - Wikipedia

    en.wikipedia.org/wiki/Nucleoprotein

    A nucleosome is a combination of DNA + histone proteins. Nucleoproteins are proteins conjugated with nucleic acids (either DNA or RNA). [1] Typical nucleoproteins include ribosomes, nucleosomes and viral nucleocapsid proteins.

  6. Nucleic acid quaternary structure - Wikipedia

    en.wikipedia.org/wiki/Nucleic_acid_quaternary...

    This is because the histone tail domains are involved in interactions between nucleosomes. The linker histone, or H1 protein, is also involved maintaining nucleosome structure. The H1 protein has the special role of ensuring that DNA stays tightly wound. [4] Modifications to histone proteins and their DNA are classified as quaternary structure.

  7. Histone-modifying enzymes - Wikipedia

    en.wikipedia.org/wiki/Histone-modifying_enzymes

    DNA is wrapped around histones to form nucleosomes.Nucleosomes are shown as "beads on a string" with the distinction between euchromatin and heterochromatin.The basic units of chromatin structure.

  8. Nucleic acid structure - Wikipedia

    en.wikipedia.org/wiki/Nucleic_acid_structure

    The image above contains clickable links Interactive image of nucleic acid structure (primary, secondary, tertiary, and quaternary) using DNA helices and examples from the VS ribozyme and telomerase and nucleosome. Nucleic acid structure refers to the structure of nucleic acids such as DNA and RNA. Chemically speaking, DNA and RNA are very similar.

  9. Quizlet - Wikipedia

    en.wikipedia.org/wiki/Quizlet

    Quizlet was founded in October 2005 by Andrew Sutherland, who at the time was a 15-year old student, [2] and released to the public in January 2007. [3] Quizlet's primary products include digital flash cards, matching games, practice electronic assessments, and live quizzes. In 2017, 1 in 2 high school students used Quizlet. [4]

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