Cell Biology Question:

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What is the relation between the concepts of chromatin and chromosome? Are euchromatin and heterochromatin part of chromosomes?

Answer:

Every filament of chromatin is a complete DNA molecule (a complete double helix), i.e., a complete chromosome. A DNA molecule may form euchromatin and heterochromatin portions thus both are part of chromosomes.

Cell Nucleus Review - Image Diversity: chromosome structure

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What are heterochromatin and euchromatin?	In the phase when the cell is not dividing (interphase) is there activity within the cell nucleus?