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

Answer

          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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