Cells have mechanisms that allow them to express genetic info selectively, following instructions relevant for that cell at that time.
A nucleus contains viscous, amorphous material enclosed by a complex nuclear envelope which forms a boundary between the nucleus and cytoplasm.
Parts of the nucleus:
-Chromosomes= Highly extended nucleoprotein fiber.
-Nuclear matrix= Protein containing fibrillar network.
-Nucleolus= 1(+) irregularly shaped electron dense amorphous structure(s) that function in rRNA synthesis and ribosomal assembly.
-Nucleoplasm= Fluid filled substance which dissolves nucleus solutes.
-Nuclear envelope= Complex 2 cellular membranes arranged parallel to each other.
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