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Structures in cell nucleus

Write down the main structures in the cell nucleus?

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In the cell nucleus the major structures are: nucleolus, optically dense region, spherical shaped, where there are strenuous ribosomal RNA (rRNA) allocated to proteins (there might be more than one nucleolus in the nucleus); chromatin, made of the DNA molecules dispersed in nuclear matrix throughout cell interphase; karyotecha, or nuclear membrane, membrane which delimits nucleus.

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