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24 May, 17:44

When a eukaryotic cell is not undergoing mitosis, the dna and its associated proteins appear as a visible network of dark fibers called the?

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  1. 24 May, 19:28
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    When a eukaryotic cell is not undergoing mitosis, the DNA and its associated proteins appear as a visible network of dark fibers called the Chromatin.

    Definition

    Chromatin is a thread like structure that can be seen inside nucleus before cell division. It is a complex of DNA and histone proteins.

    Forms of chromatin

    Chromatin exist in two forms, that is

    a. Euchromatin

    It is less condensed and can be easily transcribed.

    b. Heterochromatin

    It is highly condensed and not transcribed as easy.

    Organization of chromatin

    Microscopy has shown the appearance of chromatin as beads on a string. The beads are called nucleosomes.

    Nucleosome

    Each nucleosome is composed of DNA wrapped around eight histone proteins. The nucleosome is then wrapped into a 30nm spiral called solenoid.
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