15. What are the main
structures within the cell
nucleus?

Gap-fill exercise

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Within the cell the main
structures : the nucleolus, an
dense region, spherical ,
where there are ribosomal
RNA (rRNA) to proteins
(there be more than nucleolus
in a ); the chromatin, made
DNA molecules dispersed the nuclear
matrix the cell interphase;
karyotecha, or nuclear , the
membrane that the nucleus.