Cell Biology Question:

In the phase when the cell is not dividing (interphase) is there activity within the cell nucleus?

In the interphase there is intense metabolic activity in the cell nucleus: DNA is duplicating, euchromatin is being transcript and RNA is produced.

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What is the relation between the concepts of chromatin and chromosome? Are euchromatin and heterochromatin part of chromosomes?	How are the concepts of chromosome, chromatin and chromatids related? In which phase of the cell cycle does DNA duplicate?